vue ssr entry-client 配置 问题

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return diffed || (diffed = (prevMatched[i] !== c))

// 我们只关心非预渲染的组件
// 所以我们对比它们，找出两个匹配列表的差异组件
let diffed = false
const activated = matched.filter((c, i) => {
// 这里为什么要这样写？ 而不是 == prevMatched[i] !== c
  return diffed || (diffed = (prevMatched[i] !== c))
})

if (!activated.length) {
  return next()
}

// 这里如果有加载指示器(loading indicator)，就触发

Promise.all(activated.map(c => {
  if (c.asyncData) {
    return c.asyncData({ store, route: to })
  }
})).then(() => {

  // 停止加载指示器(loading indicator)

  next()
}).catch(next)