ElementUi——el-select下拉框

<el-select v-model="ruleForm.status" placeholder="请选择状态" @change="styleChange">

   <el-option v-for="item in optionA4" :key="item.value" :label="item.label" :value="item.value"/>
</el-select>

JS: 

     optionA4: [
        {
          value: '0',
          label: '全部状态'
        },
        {
          value: '1',
          label: '正常运行'
        },
        {
          value: '2',
          label: '离线或故障'
        },
        {
          value: '3',
          label: '超标报警'
        }
      ],

改变方法：

styleChange(val) {
    if(val == 0){
    this.isShow1 = true,
    this.isShow2 = false
    }else{
    this.isShow1 = false
    this.isShow2 = true
    }
    var data= {} 
    this.outfallType = val
      data.outfallType = this.outfallType
    getRealDataV2(data).then(val => {
        if (val.code === 200) {
        this.newData(val)
        }
    })
},