vue中this.$set()的基本用法实例

this.$set(target, propertyName/index, value)

 <el-form>
                <el-form-item label="用户地址" prop="aloWhTo">
                    <el-select v-model="form.aloWhTo" @change="testConsistent" placeholder="请选择转入仓库" readonly filterable style="width:95%" >
                        <el-option v-for="item in WarehouseOptions" :key="item.whId" :label="item.whName" :value="item.whId">
                        </el-option>
                    </el-select>
                </el-form-item>
            </el-form>
<el-button type="primary"  @click="handClick()">更改数据 </el-button>

 handClick(){
                //不起作用
                this.WarehouseOptions[0] = { whId:'4',whName:'数据是否修改'}
                // let item = { whId:'4',whName:'数据是否修改'} //此时对象的值更改了，但是视图没有更新
                // this.$set(this.WarehouseOptions,0,item)
                console.log("测试 ")
                console.log(this.WarehouseOptions[0])
            },

 handClick(){
                //不起作用
                //this.WarehouseOptions[0] = { whId:'4',whName:'数据是否修改'}
                let item = { whId:'4',whName:'数据是否修改'} //此时对象的值更改了，但是视图没有更新
                this.$set(this.WarehouseOptions,0,item)
                console.log("测试 ")
                console.log(this.WarehouseOptions[0])
            },