Solve the problem that the prompt information of form verification does not disappear and the assignment does not take effect

problem 1： The verification prompt message does not disappear
1. The drop-down box uses change Trigger

2.form Need to be defined

problem 2. Assignment does not take effect
1. Use set assignment

this.$set(this.form, 'eqName', value)

2. The change event of the drop-down box is forced to refresh

<el-form-item label=" Well name " prop="deviceName">
   <el-select v-model="addEditForm.deviceName" filterable placeholder=" Please select " clearable @change="selectPlatform" style="width:92%">
     <el-option
       v-for="item in addWellData"
       :key="item.jmc"
       :label="item.jmc"
       :value="item.jmc"
     />
   </el-select>
 </el-form-item>

selectPlatform(){
    
  this.$forceUpdate()// Force update 
},