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 个条目的数组实施了搜索功能，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，执行“自动”搜索过滤显示的结果。问题是过滤后的数组重新渲染的速度比预期的要慢，导致应用程序在渲染内容时冻结了几分之一秒。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干扰用户的方式显示？

我们的结构是一个包含 2 个子组件的父组件：一个是 Search 栏，包括下拉形式的过滤器，另一个是 SearchResultsList，它每行呈现 4 个 Bootstrap-Vue b-cards直到列表用完为止。

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 钩子和一些computed properties，它们分别进行后端调用以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大型 1200 条目数组，然后在用户输入关键字时过滤新创建的数组，就像这样

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已选择哪些过滤器并将它们存储在 Vuex 中，而 practice-people-search-results-list 组件纯粹呈现传入的 prop :people="filteredPeopleByKeyword"

我希望以上内容是有道理的，如果有人对如何加快搜索速度有想法，以避免或至少减少故障，我将不胜感激？干杯

Answer 1

过滤 1200 个元素不应该引起注意。显示的代码或应用程序的其他地方一定存在效率低下。

确保每次更改practicePeopleKeyword 时都不会调用filteredPeopleByFilters()，而仅在过滤器更改时调用。你可以通过一个快速的临时console.log 来做到这一点。 filteredPeopleByKeyword() 也一样——确保每次更新只调用一次。

在if (currentResult && officeResult && groupResult && omgResult & statusResult && positionResult) 中，您也没有从短路中受益。将其更改为类似

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

少写代码。 使用内置函数通常可以加速 JS 代码。

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
}

有

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