el-table修改某一行数据不生效怎么回事？

 1 <el-table
 2     ref="multipleTable"
 3     :class="{ 'no-multiple': !isMultiple }"
 4     @select="selectTable"
 5     border
 6     :key="isUpdate"
 7     :data="tableData"
 8   >
 9 <el-table-column label="密码" prop="pwd">
10 <template slot-scope="s">
11 <div v-else-if="col.field == 'pwd'">
12    <i v-if="s.row['pwdTemp'].indexOf('****')>-1"  class="el-icon-view icon-eye" @click="view(s.$index, s.row)"></i>
13    <i v-else  class="iconfont icon-yanjing-biyan icon-eye" @click="view(s.$index, s.row)"></i>
14    <span>{{ s.row['pwdTemp'] }}</span>
15 </div>
16 </template>
17 </el-table-column>
18 </el-table>

 1 // 隐藏密码
 2     hidePassword(val) {
 3       let str = ''
 4       for (let i = 0; i < val.length; i++) {
 5         if (i == 0) {
 6           const s = val.slice(i, 1)
 7           str = str.concat(s)
 8         } else if (i == val.length - 1) {
 9           const s = val.slice(i - 1, i)
10           str = str.concat(s)
11         } else {
12           str = str.concat('*')
13         }
14       }
15       return str
16     },
17     //显示隐藏密码操作，控制某一行数据密码的显示、隐藏
18     view(index, row) {
19       if (row['pwdTemp'].indexOf('****') > -1) {
20         this.$set(row,'pwdTemp',row['pwd'])
21       } else {
22         this.$set(row,'pwdTemp',this.hidePassword(this.tableData[index]['pwd']))
23       }
24       this.tableData.splice(index,1,row)
25       this.isUpdate = !this.isUpdate; //每次改变key值则可以触发表格数据更新
26     }