message: docs(how-to-install): update doc
diff: @@ -24,6 +24,46 @@ If it is the syntax of commonjs, as follows:
  var BScroll = require('@better-scroll/scroll')
  ```
  -## script
  +## Script
  BetterScroll also supports direct loading with script, which loads a BScroll object on the window after loading.
  +
  +```html
  +<script src="https://unpkg.com/@better-scroll/core@latest/dist/core.js"></script>
  +
  +<!-- minify -->
  +<script src="https://unpkg.com/@better-scroll/core@latest/dist/core.min.js"></script>
  +```
  +
  +```js
  +let wrapper = document.getElementById("wrapper")
  +let bs = new BScroll(wrapper, {})
  +```
  +
  +## BetterScroll with all plugins
  +
  +```bash
  +npm install better-scroll --save
  +
  +// or
  +
  +yarn add better-scroll
  +```
  +
  +```js
  + import BetterScroll from 'better-scroll'
  + let bs = new BetterScroll('.wrapper', {})
  +```
  +
  +Use script.
  +
  +```html
  +<script src="https://unpkg.com/better-scroll@latest/dist/better-scroll.js"></script>
  +
  +<!-- minify -->
  +<script src="https://unpkg.com/better-scroll@latest/dist/better-scroll.min.js"></script>
  +```
  +
  +```js
  + let bs = BetterScroll.createBScroll('.wrapper', {})
  +```
  \ No newline at end of file
  