text: (window.webpackJsonp=window.webpackJsonp||[]).push([[84],{578:function(s,t,a){"use strict";a.r(t);var r=a(3),e=Object(r.a)({},(function(){var s=this,t=s.$createElement,a=s._self._c||t;return a("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[a("div",{staticClass:"language-js line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-js"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// iconfont")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1.")]),s._v(" 相对于图片减少了请求数量和体积\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.")]),s._v(" 矢量图形，可伸缩\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3.")]),s._v(" iconfont 可以直接通过 css 修改样式 "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 颜色为单色")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// svg")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1.")]),s._v(" 保持了图片能力，支持多色彩\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.")]),s._v(" 矢量图形\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3.")]),s._v(" xml 语法，搜索引擎 seo 和无障碍读屏软件读取\n"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// flexbox")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1.")]),s._v(" flexbox 布局比 float 布局消耗时间断\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.")]),s._v(" flexbox 结合媒体查询可以实现响应式 "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 子元素 flex 属性")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 优化资源加载的顺序")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1.")]),s._v(" 可以在 network 的 priority 查看资源加载的优先级\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.")]),s._v(" 浏览器有默认的加载优先级：html ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" head 中的 js 和 css ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" dom 中的图片和字体\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3.")]),s._v(" preload "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 提前加载，较晚出现，对当前页面非常重要的资源，只管加载不管解析，所以必须要声明解析")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v("link ref"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"preload"')]),s._v(" href"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"img/dog.svg"')]),s._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("as")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"image"')]),s._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("/")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v("link ref"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"preload"')]),s._v(" href"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"font.woff2"')]),s._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("as")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"font"')]),s._v(" crossorigin"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"anonymous"')]),s._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("/")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 字体必须加 crossorigin 属性跨域")]),s._v("\n    webpack 中的 "),a("span",{pre:!0,attrs:{class:"token string"}},[s._v("'import'")]),s._v(" 函数中的魔法注释原理就是这个\n      "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("import")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("/* webpackPreload: true */")]),s._v(" url"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("4.")]),s._v(" prefatch "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 提前加载后继路由需要的资源，优先级低，会在页面加载完其他东西后进行加载,只管加载不管解析，所以必须要声明解析")]),s._v("\n    webpack 中的 "),a("span",{pre:!0,attrs:{class:"token string"}},[s._v("'import'")]),s._v(" 函数中的魔法注释原理就是这个\n    "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("<")]),s._v("link ref"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"prefatch"')]),s._v(" href"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"img/dog.svg"')]),s._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("as")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("=")]),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"image"')]),s._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("/")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("import")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("/* webpackPreload: true */")]),s._v(" url"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 预渲染")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1.")]),s._v(" 大型单页应用的性能瓶颈：js 下载 "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+")]),s._v(" 解析 "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+")]),s._v(" 执行\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.")]),s._v(" ssr 的主要问题：牺牲 "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("TTFB")]),s._v(" 来补救 First Paint 且实现复杂\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3.")]),s._v(" 可以通过 Pre"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),s._v("rendering 在打包时提前渲染页面，且不用服务端参与\n    React"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),s._v("Snap 是用来做 Pre"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),s._v("rendering 即预渲染的库 "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// npm install React-Snap -D")]),s._v("\n    原理是在 build 后会自动执行 postbuild，在后台打开类似 chrome 的浏览器去爬取页面\n      在 "),a("span",{pre:!0,attrs:{class:"token keyword"}},[s._v("package")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),s._v("json 中的 script 中配置 "),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"postbuild"')]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(":")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[s._v('"react-snap"')]),s._v("\n      使用 ReactDOM"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[s._v("hydrate")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v("\n      内联样式，避免明显的 "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("FOUC")]),s._v(" 即样式闪动\n"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// Windowing 窗口化提高列表性能")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1.")]),s._v(" 加载大列表、大表单的每一行严重影响性能\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.")]),s._v(" Lazy loading 仍然会让 "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("DOM")]),s._v(" 变得过大\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3.")]),s._v(" windowing 只渲染可见的行，渲染和滚动的性能都会提升\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("4.")]),s._v(" npm install react"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),s._v("window "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("D")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 使用骨架组件减少布局移动")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1.")]),s._v(" npm intsall react"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),s._v("placeholder "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("D")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 从输入 url 到页面加载显示完成都发生了什么？")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1.")]),s._v(" 包括 Browser Process 和 Renderer Process "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 浏览器进程和渲染进程")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.")]),s._v(" Browser Process 包括 "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("UI")]),s._v(" thread 和 Network thread "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// Ui 线程和 网络线程")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3.")]),s._v(" Renderer Process 包括 Main thread 和 Raster thread 和 Compositor thread "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 主线程和绘制线程和复合线程")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("4.")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("UI")]),s._v(" thread：搜索关键词或 url 请求站点 "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// ui 线程做的工作")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("5.")]),s._v(" Network thread："),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("DNS")]),s._v(" 查找 "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("IP")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v("(")]),s._v("如果是 https 会建立 "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("TLS")]),s._v(" 连接"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[s._v(")")]),s._v(" ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" 设置 "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("UA")]),s._v(" 等信息发送请求 ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" web server 响应 ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" 读取 response 分析数据类型\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("6.")]),s._v(" Browser Process 把分析完的数据传递给 Renderer Process\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("7.")]),s._v(" Main thread：解析文本构建 "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("DOM")]),s._v(" ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" 边解析 "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("DOM")]),s._v(" 边加载子资源 ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("JS")]),s._v(" 阻塞解析 ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" 解析 css 计算 computed styles 即每个元素的 style ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" 构造布局树即位置大小\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("8.")]),s._v(" Raster thread "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("+")]),s._v(" Compositor thread：创建绘制记录确定绘制的顺序 ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" 将页面拆分图层构建图层树 ——"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" 复合线程像素化图层创建一个复合帧\n"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("--")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 什么是首屏加载？怎么优化？")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("1.")]),s._v(" 首屏即用户初次印象，第一见到的页面\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.")]),s._v(" 首屏加载用户体验的 "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3")]),s._v(" 个关键时刻：\n    什么时候有内容出现 "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 白屏")]),s._v("\n    什么时候出现有意思的内容，是否用户想要的\n    什么时候可以进行交互\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3.")]),s._v(" 什么时候有内容出现的优化标准？ "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// First Contentful Paint (FCP)")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("0")]),s._v("s —— "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2")]),s._v("s "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 优")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2")]),s._v("s —— "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("4")]),s._v("s "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 中")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("4")]),s._v("s "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 差")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("4.")]),s._v(" 什么时候出现有意思的内容，是否用户想要的优化标准？ "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// Largest Contentful Paint (LCP)")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("0")]),s._v("s —— "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.5")]),s._v("s "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 优")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2.5")]),s._v("s —— "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("4")]),s._v("s "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 中")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("4")]),s._v("s "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 差")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("5.")]),s._v(" 什么时候可以进行交互的优化标准？ "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// Time to Interactive (TTI)")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("0")]),s._v("s —— "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3.8")]),s._v("s "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 优")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("3.8")]),s._v("s —— "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("7.3")]),s._v("s "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 中")]),s._v("\n    "),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v(">")]),s._v(" "),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("7.3")]),s._v("s "),a("span",{pre:!0,attrs:{class:"token comment"}},[s._v("// 差")]),s._v("\n"),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("6.")]),s._v(" 优化策略：\n    资源体积太大？\n      资源压缩、传输压缩、代码拆分、Tree shaking、"),a("span",{pre:!0,attrs:{class:"token constant"}},[s._v("HTTP")]),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("/")]),a("span",{pre:!0,attrs:{class:"token number"}},[s._v("2")]),s._v("、缓存\n    首页内容太多？\n      路由"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("/")]),s._v("组件"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("/")]),s._v("内容 lazy"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("-")]),s._v("loading、预渲染"),a("span",{pre:!0,attrs:{class:"token operator"}},[s._v("/")]),s._v("ssr、Inline Css\n    加载顺序不合适？\n      prefetch、preload\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br"),a("span",{staticClass:"line-number"},[s._v("8")]),a("br"),a("span",{staticClass:"line-number"},[s._v("9")]),a("br"),a("span",{staticClass:"line-number"},[s._v("10")]),a("br"),a("span",{staticClass:"line-number"},[s._v("11")]),a("br"),a("span",{staticClass:"line-number"},[s._v("12")]),a("br"),a("span",{staticClass:"line-number"},[s._v("13")]),a("br"),a("span",{staticClass:"line-number"},[s._v("14")]),a("br"),a("span",{staticClass:"line-number"},[s._v("15")]),a("br"),a("span",{staticClass:"line-number"},[s._v("16")]),a("br"),a("span",{staticClass:"line-number"},[s._v("17")]),a("br"),a("span",{staticClass:"line-number"},[s._v("18")]),a("br"),a("span",{staticClass:"line-number"},[s._v("19")]),a("br"),a("span",{staticClass:"line-number"},[s._v("20")]),a("br"),a("span",{staticClass:"line-number"},[s._v("21")]),a("br"),a("span",{staticClass:"line-number"},[s._v("22")]),a("br"),a("span",{staticClass:"line-number"},[s._v("23")]),a("br"),a("span",{staticClass:"line-number"},[s._v("24")]),a("br"),a("span",{staticClass:"line-number"},[s._v("25")]),a("br"),a("span",{staticClass:"line-number"},[s._v("26")]),a("br"),a("span",{staticClass:"line-number"},[s._v("27")]),a("br"),a("span",{staticClass:"line-number"},[s._v("28")]),a("br"),a("span",{staticClass:"line-number"},[s._v("29")]),a("br"),a("span",{staticClass:"line-number"},[s._v("30")]),a("br"),a("span",{staticClass:"line-number"},[s._v("31")]),a("br"),a("span",{staticClass:"line-number"},[s._v("32")]),a("br"),a("span",{staticClass:"line-number"},[s._v("33")]),a("br"),a("span",{staticClass:"line-number"},[s._v("34")]),a("br"),a("span",{staticClass:"line-number"},[s._v("35")]),a("br"),a("span",{staticClass:"line-number"},[s._v("36")]),a("br"),a("span",{staticClass:"line-number"},[s._v("37")]),a("br"),a("span",{staticClass:"line-number"},[s._v("38")]),a("br"),a("span",{staticClass:"line-number"},[s._v("39")]),a("br"),a("span",{staticClass:"line-number"},[s._v("40")]),a("br"),a("span",{staticClass:"line-number"},[s._v("41")]),a("br"),a("span",{staticClass:"line-number"},[s._v("42")]),a("br"),a("span",{staticClass:"line-number"},[s._v("43")]),a("br"),a("span",{staticClass:"line-number"},[s._v("44")]),a("br"),a("span",{staticClass:"line-number"},[s._v("45")]),a("br"),a("span",{staticClass:"line-number"},[s._v("46")]),a("br"),a("span",{staticClass:"line-number"},[s._v("47")]),a("br"),a("span",{staticClass:"line-number"},[s._v("48")]),a("br"),a("span",{staticClass:"line-number"},[s._v("49")]),a("br"),a("span",{staticClass:"line-number"},[s._v("50")]),a("br"),a("span",{staticClass:"line-number"},[s._v("51")]),a("br"),a("span",{staticClass:"line-number"},[s._v("52")]),a("br"),a("span",{staticClass:"line-number"},[s._v("53")]),a("br"),a("span",{staticClass:"line-number"},[s._v("54")]),a("br"),a("span",{staticClass:"line-number"},[s._v("55")]),a("br"),a("span",{staticClass:"line-number"},[s._v("56")]),a("br"),a("span",{staticClass:"line-number"},[s._v("57")]),a("br"),a("span",{staticClass:"line-number"},[s._v("58")]),a("br"),a("span",{staticClass:"line-number"},[s._v("59")]),a("br"),a("span",{staticClass:"line-number"},[s._v("60")]),a("br"),a("span",{staticClass:"line-number"},[s._v("61")]),a("br"),a("span",{staticClass:"line-number"},[s._v("62")]),a("br"),a("span",{staticClass:"line-number"},[s._v("63")]),a("br"),a("span",{staticClass:"line-number"},[s._v("64")]),a("br"),a("span",{staticClass:"line-number"},[s._v("65")]),a("br"),a("span",{staticClass:"line-number"},[s._v("66")]),a("br"),a("span",{staticClass:"line-number"},[s._v("67")]),a("br"),a("span",{staticClass:"line-number"},[s._v("68")]),a("br"),a("span",{staticClass:"line-number"},[s._v("69")]),a("br"),a("span",{staticClass:"line-number"},[s._v("70")]),a("br"),a("span",{staticClass:"line-number"},[s._v("71")]),a("br"),a("span",{staticClass:"line-number"},[s._v("72")]),a("br"),a("span",{staticClass:"line-number"},[s._v("73")]),a("br"),a("span",{staticClass:"line-number"},[s._v("74")]),a("br"),a("span",{staticClass:"line-number"},[s._v("75")]),a("br"),a("span",{staticClass:"line-number"},[s._v("76")]),a("br"),a("span",{staticClass:"line-number"},[s._v("77")]),a("br"),a("span",{staticClass:"line-number"},[s._v("78")]),a("br"),a("span",{staticClass:"line-number"},[s._v("79")]),a("br"),a("span",{staticClass:"line-number"},[s._v("80")]),a("br"),a("span",{staticClass:"line-number"},[s._v("81")]),a("br")])])])}),[],!1,null,null,null);t.default=e.exports}}]);