获取焦点 失去焦点更改input输入框样式

<el-input v-model="item.cargoCount" @focus="cleanVerify('数量',$event)"
　　　　　　　　　　　　　@blur="verifyNumber(item.cargoCount,$event)" placeholder="请输入数量"/>

//获取焦点是清空数据
cleanVerify(val, event) {
  let input = event.currentTarget
 input.placeholder = "请输入" + val
  input.style.border = "1px solid #C0C4CC"
},

//失去焦点验证输入的是否为number类型的
verifyNumber(val, event) {
  if (parseInt(val)) {
    this.warningInfo = ""
  } else {
    let input = event.currentTarget
 input.placeholder = "请输入数字"
 input.value = ""
    input.style.border = "1px solid #DC143C"
  }
},