el-table 中使用el-checkbox 只有第一页生效，翻页后其它勾选为生效

修改前代码

<el-table 
      class="margin-top-10"
      :data="tableList" 
      style="width: 99%;" 
      size="mini" 
      :header-cell-style="getTableHeaderRowClass"
      stripe
      tooltip-effect="light"
      >
      
        <el-table-column 
        prop="support_cpd" 
        label="开启投放CPD权限" 
        align="center" 
        width="150"
        >
            <template slot-scope="scope">
            <el-checkbox 
            @change="supportCpd(scope.row)"
            :checked="scope.row.support_cpd===1 ? true : false">
            </el-checkbox>
          </template>
        </el-table-column>
<el-table>

设置了第二页该项勾选了， 再到第一页，再到第二页， 该项没被勾选

解决方案：
需要在el-table 中增加:row-key="(row)=>{return row.id}"
在el-table-column 中增加 :reserve-selection="true"

修改后的代码：

<el-table 
      class="margin-top-10"
      :data="tableList" 
      style="width: 99%;" 
      size="mini" 
      :header-cell-style="getTableHeaderRowClass"
      stripe
      tooltip-effect="light"
      :row-key="(row)=>{return row.id}"  //***************
      >
       
        <el-table-column 
        prop="support_cpd" 
        label="开启投放CPD权限" 
        align="center" 
        width="150"
        :reserve-selection="true"  //***************
        >
          
          <template slot-scope="scope">
            <el-checkbox 
            @change="supportCpd(scope.row)"
            :checked="scope.row.support_cpd===1 ? true : false">
            </el-checkbox>
          </template>
        </el-table-column>
<el-table>