下载表格文件 弹出选择保存文件路径

1.npm安装依赖

npm install vue-json-excel

2.项目主文件入口main.js全局引入

import JsonExcel from 'vue-json-excel'

Vue.component('downloadExcel', JsonExcel)

组件里面

import JsonExcel from 'vue-json-excel'

注册一下

  components: {

    downloadExcel: JsonExcel

  },

      在组件里面使用
　　　　<download-excel
        style="display:inline-block"
        :fields="jsonFields"
        :fetch="getTable"
        name="teacher_data_时间.xls"
      >
        <el-popover placement="bottom" width="160" v-model="visible" trigger="hover">
          <p>选择导出列</p>
          <div style="text-align: right; margin: 0">
            <div style="margin: 15px 0;">
              <el-checkbox-group
                v-model="checkedJson"
                @change="handleCheckedCitiesChange"
              >
                <el-checkbox
                  v-for="(item, index) in jsonList"
                  :label="item.name"
                  :key="index"
                  style="float:left"
                  >{{ item.name }}</el-checkbox
                >
              </el-checkbox-group>
            </div>
          </div>
          <el-button type="primary" slot="reference" :loading="ExcelFlag"
            >导出EXCEL</el-button
          >
        </el-popover>
      </download-excel>

上图解码

 我们先看for="(item, index) in jsonList"   v-model="checkedJson"  @change="handleCheckedCitiesChange"

 

 代码给你们贴上

  mounted() {
    this.search()
    this.getArea()
    this.getVersionList()
    this.checkedJson = this.jsonList.map(item => item.name)
    this.getFields()
  },
  methods: {
    // 复选框切导出列
    handleCheckedCitiesChange(value) {
      this.getFields()
    },
    // 整理fields数据格式
    getFields() {
      this.jsonFields = {}
      this.checkedJson.forEach(item => {
        for (let i = 0; i < this.jsonList.length; i++) {
          if (this.jsonList[i].name === item) {
            this.jsonFields[this.jsonList[i].name] = this.jsonList[i].value
          }
        }
      })
    },

我们再看:fetch="getTable"   这个回调函数写了什么

 这个是searchAll()没啥讲解的就是获取数据 操作一下返回一下 

 async searchAll() {
      await this.search()
      this.ExcelList = []
      this.ExcelFlag = true
      if (this.pages.total > 5000) {
        this.$message.warning('目前导出数量大于5000条，请缩小检索范围')
      }
      var body = {
        count: this.pages.total > 5000 ? 5000 : this.pages.total,
        liveid: this.form.liveId,
        teacherid: this.form.teacherId,
        teacherrole: this.form.teacherRole,
        area: this.form.area,
        version: this.form.version
      }
      return request({
        method: 'get',
        url: ‘接口’,
        params: body
      }).then(res => {
        res.Content.Datas.forEach(item => {
          item.idName = `${item.TeacherID}(${item.TeacherName})`
          item.IPArea = `${item.IP}(${item.Area})`
          this.ExcelList.push(item)
        })
        this.ExcelFlag = false
        return this.ExcelList
      })

 上面开始调用了await this.search() 

 search() {
      this.loading = true
      var body = {
        page: this.pages.page,
        count: this.pages.count,
        liveid: this.form.liveId,
        teacherid: this.form.teacherId,
        teacherrole: this.form.teacherRole,
        area: this.form.area,
        version: this.form.version
      }
      return request({
        method: 'get',
        url: '接口',
        params: body
      }).then(res => {
        this.loading = false
        this.realtimeList = res.Content.Datas
        this.pages = {
          total: res.Content.TotalNum,
          page: res.Content.PageNum,
          count: res.Content.PageSize
        }
      })
    },

大家发现没有环环相扣的数据 最后是在searchAll这个函数返回的this.ExcelList才是我们想要的数据   要这个数据就先serach（）获取数据

最后下下来的表格就是这样的   下载表格弹出文件夹