<el-table-column prop="password" label="密码" align="center">
          <template slot-scope="scope">
            <div class="flex">
              <div  v-if="!scope.row.show">
                <span @click="handleShow(scope.$index,scope.row)">******</span>
              </div>
              <div v-else>
                <span v-if="scope.row.show">{{scope.row.password}}</span>
                <i slot="suffix"
                   class="el-icon-view"
                   @click="handleShow(scope.$index,scope.row)"
                />
              </div>
            </div>
          </template>
        </el-table-column>

methods: {
      handleShow(index,row){
       // row.show=!row.show
        this.tableData[index].show =!row.show
        this.$set(this.tableData,index,row)
      }
}

初始化获得列表接口的时候，主动加上show属性
  for(let item of this.tableData){
                item.show = false
  }