text: import { compareDate } from '@theme/helpers/utils'
  
  // 过滤博客数据
  export function filterPosts (posts, isTimeline) {
    posts = posts.filter((item, index) => {
      const { title, frontmatter: { home, date, publish } } = item
      // 过滤多个分类时产生的重复数据
      if (posts.indexOf(item) !== index) {
        return false
      } else {
        const someConditions = home === true || title == undefined || publish === false
        const boo = isTimeline === true
          ? !(someConditions || date === undefined)
          : !someConditions
        return boo
      }
    })
    return posts
  }
  
  // 排序博客数据
  export function sortPostsByStickyAndDate (posts) {
    posts.sort((prev, next) => {
      const prevSticky = prev.frontmatter.sticky
      const nextSticky = next.frontmatter.sticky
      if (prevSticky && nextSticky) {
        return prevSticky == nextSticky ? compareDate(prev, next) : (prevSticky - nextSticky)
      } else if (prevSticky && !nextSticky) {
        return -1
      } else if (!prevSticky && nextSticky) {
        return 1
      }
      return compareDate(prev, next)
    })
  }
  
  export function sortPostsByDate (posts) {
    posts.sort((prev, next) => {
      return compareDate(prev, next)
    })
  }
  