ElementUI两个小坑

1.form表单绑定的是一个对象，表单里的一个输入项是对象的一个属性之一，修改输入项，表单没刷新的问题，

<el-form :model="formData" :rules="rules" ref="editForm" class="demo-ruleForm">
    <el-form-item label="执行时段" prop="executeTime" required >
       <div v-for="(executeTimeItem, index) in formData.executeTimeList" :key="index">
                                指定时刻{{ index + 1 }}&nbsp;
          <el-time-picker v-model="formData.executeTimeList[index]" placeholder="选择时"
              @change="(val) => onExecuteTimeRangeChange(val, index)"
              :picker-options="{ selectableRange: '18:30:00 - 20:30:00' }">
         </el-time-picker>&nbsp;&nbsp;
         <img class="voice-info-icon-img"     
            :src="require(`@/assets/images/home/material/icon_add.svg`)" 
            @click="addExecuteTime"
           v-if="formData.executeTimeList.length == (index + 1)" />&nbsp;
        <img class="voice-info-icon-img"
            :src="require(`@/assets/images/home/material/icon_delete.svg`)"
            @click="deleteExecuteTime(index)" v-if="formData.executeTimeList.length > 1" />
      </div>
   </el-form-item>
</el-form>

这时，怎么修改都没用，

可有用下面方法去修改：

// 执行时段变化时修改formData
        onExecuteTimeRangeChange(value, index) {
            console.info('onExecuteTimeRangeChange  value----------', value, index)
            let temp = this.formData.executeTimeList;
                temp[index] = value;
                this.$set(this.formData, 'executeTimeList', temp);

        },

2.elementUI 的table 动态显示字段，使用v-if绑定在<el-table-column>标签上，显示效果错乱

解决办法：只需要在<el-table-column>标签上加个key属性即可

<el-table-column type="selection" width="55" v-if="manageState" key="selection">
</el-table-column>