toggleSelection(rows) {
    if (rows) {
     rows.forEach(row => {
      this.$refs.multipleTable.toggleRowSelection(row);
     });
    } else {
     this.$refs.multipleTable.clearSelection();
    }
   }

<el-dialog class="contract_modal" title="信息" :visible.sync="glht_modal" width="80%" :modal="false" @close="cancel">
 <el-form :inline="true" :model="searchData" label-width="90px">
  <el-form-item label="名稱：">
   <el-input v-model.trim="searchData.mc_" size="small" class="contract_input"></el-input>
  </el-form-item>
  <span class="list_btns">
   <el-button type="primary" size="small" @click="listSearch(page, 1)" class="con_btn">搜索</el-button>
   <el-button size="small" @click="searchData = {}" class="con_btn">清空</el-button>
  </span>
 </el-form>
 <div id="list_body" class="list-body" style="padding-left: 0;">
  <el-table :data="tableData" stripe border style="width: 100%" max-height="480" ref="multipleTable" @select-all="handleSelectionAll" @select="handleSelectionChange">
   <el-table-column type="selection" width="26" align="right"></el-table-column>
   <el-table-column type="index" width="50" label="序號(hào)" align="left" header-align="left"></el-table-column>
   <el-table-column prop="mc_" label="名稱" width="180" show-overflow-tooltip align="left"></el-table-column>
   
  </el-table>
  <div class="list-pagination">
   <el-pagination background @size-change="handleSizeChange" @current-change="handleCurrentChange"
           :current-page.sync="page.page" :page-sizes="[10, 20, 50, 100]":page-size="page.pageCount"
           layout="total, sizes, prev, pager, next, jumper, ->"
           :total="page.total"></el-pagination>
  </div>
 </div>
 <div slot="footer" class="dialog-footer">
  <el-button type="primary" @click="save" size="small">確定</el-button>
  <el-button @click="cancel" size="small">取消</el-button>
 </div>
</el-dialog>

// 全選  當(dāng)val有數(shù)據(jù)，即為全選；為空數(shù)組，即為取消全選
handleSelectionAll (val) {
 // 獲取所有選中的數(shù)據(jù) 
 this.records = JSON.parse(localStorage.getItem('glht'))
 if(val.length !== 0) {  
  //全選
  // this.records = Array.from(new Set(val.concat(this.records)))  發(fā)現(xiàn)去重不好用！只能手動(dòng)push了
  // 全選選中的一定是本頁(yè)所有數(shù)據(jù)，所以循環(huán)本頁(yè)
  this.tableData.forEach((v) => {
   if(this.records.find((e,index) => { return v.id_ === e.id_})){}else {
    // 如果數(shù)組中沒有就把選中的push進(jìn)去
    this.records.push(v)
   }
  })
 } else {   
  // 取消全選，在選中的所有信息中把本頁(yè)列表有的刪除
  this.tableData.forEach((v) => {
   this.records.forEach((e,index) => {
    if (e.id_ === v.id_) {
     this.records.splice(index, 1)
    }
   })
  })
 }
 // 每次選的數(shù)據(jù)暫時(shí)存一下
 localStorage.setItem('glht', JSON.stringify(this.records))
},
// 單選 
handleSelectionChange(val, row) {
 // 獲取所有選中的數(shù)據(jù) 
 this.records = JSON.parse(localStorage.getItem('glht'))
 if (this.records.length === 0) {
  // 還沒有選中任何數(shù)據(jù)
  this.records = [row]
 } else {
  if (this.records.filter(i => { return i.id_ === row.id_ }).length === 0) {
    // 已選中的數(shù)據(jù)里沒有本條(取消)，把這條加進(jìn)來(lái)
   this.records.push(row)
  } else {
    // 已選中的數(shù)據(jù)里有本條(取消選中)，把這條刪除
   this.records.forEach((e,index) => {
    if (e.id_ === row.id_) {
     this.records.splice(index, 1)
    }
   })
  }
 }
 // 每次選的數(shù)據(jù)暫時(shí)存一下
 localStorage.setItem('glht', JSON.stringify(this.records))
},

listGet() {
  this.$axios.post("interface", {}, { params: searchData }).then(res => {
   if (res.data.success) {
    this.tableData = res.data.data.rows;
    this.page.total = res.data.data.total;
    this.records = JSON.parse(localStorage.getItem('yglht'))
    this.toggleSelection(JSON.parse(localStorage.getItem('yglht')));  // 反選操作
   } else {
    this.$message.error(res.data.message)
   }
  })
 .catch(err => console.log(err));
},
// 反選處理
toggleSelection(rows) {
 let arr =[]
 this.tableData.forEach((e, index) => {
  rows.forEach((i, ind) => {
   if (e.id_ === i.id_) {
     arr.push(this.tableData[index])
   }
  })
 })
 if (arr) {
  this.$nextTick(() => {
   arr.forEach(row => {
    this.$refs.multipleTable.toggleRowSelection(row);
   });
  })
 } else {
  this.$refs.multipleTable.clearSelection();
 }
},

save () {
 this.glht_modal = false
 localStorage.setItem('yglht', localStorage.getItem('glht'))
 this.yglht()
},
cancel () {
 this.glht_modal = false
 // 取消時(shí) 取在頁(yè)面上的值
 localStorage.setItem('glht', localStorage.getItem('yglht'))
 // this.toggleSelection(JSON.parse(localStorage.getItem('yglht')));  直接寫不好用
 this.listGet({})  // 獲取彈出框列表數(shù)據(jù)，這里調(diào)用一次是因?yàn)榉乐乖俅未蜷_彈出框閃現(xiàn)之前選擇的內(nèi)容
 this.yglht()
},
yglht() {
  this.list = JSON.parse(localStorage.getItem('yglht'))
  // 處理this.list中地址、時(shí)間等頁(yè)面顯示問題
}