javascript - 如何优化/加速 Vue JS 应用程序中的自动搜索？

Question

我们已经对大约 1200 个条目的数组实现了搜索功能，其中包含 6 个过滤器和一个搜索关键字。当用户选择任何过滤器或键入关键字时，将执行“自动”搜索来过滤显示的结果。问题在于，过滤后的数组重新渲染速度比预期慢，导致应用程序在渲染内容时卡住一小部分时间。我的问题是如何优化以下代码以获得更好的用户体验，即在输入搜索关键字或选择过滤器时，结果应该快速显示或以不会打扰用户的方式显示？

我们的结构是一个父组件，其中包含 2 个子组件:一个是 Search 栏，包括下拉列表形式的过滤器，另一个是呈现的 SearchResultsList每行 4 个 Bootstrap-Vue b-card，直到列表耗尽。

在父级中，我们像这样渲染两个子级:

<b-row
  class="pt-sm-4 p-sm-0 p-2 bg-white"
  no-gutters
>
  <b-col
    sm="12"
    class="px-sm-3 mb-4"
  >
    <!-- People Search Bar -->
    <practice-people-search
      :people="filteredPeopleByKeyword"
      @togglePracticePeopleFiltersEvent="onTogglePracticePeopleFiltersEvent"/>

    <!-- Practice People Search Results List -->
    <practice-people-search-results-list
      :people="filteredPeopleByKeyword"
      :show-practice-people-filters="showPracticePeopleFilters"/>
  </b-col>
</b-row>

我们还有一个created钩子(Hook)和一些计算属性，它们分别进行后端调用来获取数据并过滤传入的数组。我们首先使用默认过滤器和/或任何其他选定的过滤器过滤包含 1200 个条目的大型数组，然后在用户键入关键字时过滤新创建的数组，如下所示

computed: {
    ...mapState('practice', [
      'practicePeopleKeyword',
      'practicePeopleCurrentValue',
      'practicePeopleOfficesValue',
      'practicePeopleGroupsValue',
      'practicePeopleOMGsValue',
      'practicePeopleStatusValue',
      'practicePeoplePositionValue']),
    filteredPeopleByFilters () {
      let filteredPeopleByFiltersArray = []
      for (let i = 0; i < this.people.length; i++) {
        let person = this.people[i]

        let currentResult = (this.practicePeopleCurrentValue.length === 0 || this.practicePeopleCurrentValue.filter((v) => {
          let cr = true
          switch (v.Value) {
            case 0:
              cr = (person.practiceCurrent === 1) && (person.officeCurrent === 1) && (person.groupCurrent === 1)
              break
            case 1:
              cr = (person.practiceCurrent === 0) && (person.started === 1)
              break
            case 2:
              cr = (person.practiceCurrent === 1) && (person.officeCurrent === 0)
              break
            case 3:
              cr = (person.practiceCurrent === 1) && (person.groupCurrent === 0)
              break
            case 4:
              cr = (person.started === 0)
              break
          }
          return cr
        }).length !== 0)
        let officeResult = (this.practicePeopleOfficesValue.length === 0 || this.practicePeopleOfficesValue.filter((v) => { return v.Value === person.mo_ref }).length !== 0)
        let groupResult = (this.practicePeopleGroupsValue.length === 0 || this.practicePeopleGroupsValue.filter((v) => { return v.Value === person.gp_ref }).length !== 0)
        let omgResult = (this.practicePeopleOMGsValue.length === 0 || this.practicePeopleOMGsValue.filter((v) => { return v.Value === person.omg_ref }).length !== 0)
        let statusResult = (this.practicePeopleStatusValue.length === 0 || this.practicePeopleStatusValue.filter((v) => {
          return (v.Value === person.mk_ref) || (v.Value === person.md_type)
        }).length !== 0)
        let positionResult = (this.practicePeoplePositionValue.length === 0 || this.practicePeoplePositionValue.filter((v) => {
          return v.Value === person.ms_ref || ((v.Value === -2) && (person.isPE === 1))
        }).length !== 0)

        if (currentResult && officeResult && groupResult && omgResult & statusResult && positionResult) {
          filteredPeopleByFiltersArray.push(person)
        }
      }
      return filteredPeopleByFiltersArray
    },
    filteredPeopleByKeyword () {
      let filteredPeopleByKeywordArray = []
      for (let i = 0; i < this.filteredPeopleByFilters.length; i++) {
        let person = this.filteredPeopleByFilters[i]

        let searchKeywordResult = (this.practicePeopleKeyword === '' || person.psname.indexOf(this.practicePeopleKeyword) > -1)

        if (searchKeywordResult) {
          filteredPeopleByKeywordArray.push(person)
        }
      }
      return filteredPeopleByKeywordArray
    }
  }

practice-people-search 组件中的代码具有计算属性，以了解选择了哪些过滤器并将它们存储在 Vuex 中，同时 practice-people-search-results-list code> 组件纯粹渲染传入的 prop :people="filteredPeopleByKeyword"

我希望上述内容有意义，如果有人对如何加快搜索速度有任何想法，以避免或至少最小化故障，我将不胜感激？干杯

Answer 1

过滤 1200 个元素应该不会被注意到。显示的代码或应用程序的其他地方肯定存在一些效率低下的地方。

确保 filteredPeopleByFilters() 不会在每次 practicePeopleKeyword 更改时调用，而仅在过滤器更改时调用。您可以使用快速临时 console.log 来完成此操作。与 filteredPeopleByKeyword() 相同 - 确保每次更新仅调用一次。

同样在 if (currentResult && officeResult && groupResult && omgResult & statusResult &&positionResult) 中，您没有从短路中受益。将其更改为类似的内容

    let currentResult = ...
    if (!currentResult) continue;
    let officeResult = ...
    if (!officeResult) continue;
    let groupResult = ...
    if (!groupResult) continue;
    ... etc ...

编写更少的代码。 使用内置函数通常可以加快 JS 代码的速度。

例如，尝试替换

filteredPeopleByKeyword () {
  let filteredPeopleByKeywordArray = []
  for (let i = 0; i < this.filteredPeopleByFilters.length; i++) {
    let person = this.filteredPeopleByFilters[i]

    let searchKeywordResult = (this.practicePeopleKeyword === '' || person.psname.indexOf(this.practicePeopleKeyword) > -1)

    if (searchKeywordResult) {
      filteredPeopleByKeywordArray.push(person)
    }
  }
  return filteredPeopleByKeywordArray
}

与

filteredPeopleByKeyword () {
  return this.filteredPeopleByFilters.filter(
    person => person.psname.indexOf(this.practicePeopleKeyword) > -1
  )
}