獲取焦點 失去焦點更改input輸入框樣式

<el-input v-model="item.cargoCount" @focus="cleanVerify('數量',$event)"
　　　　　　　　　　　　　@blur="verifyNumber(item.cargoCount,$event)" placeholder="請輸入數量"/>

//獲取焦點是清空數據
cleanVerify(val, event) {
  let input = event.currentTarget
  input.placeholder = "請輸入" + val
  input.style.border = "1px solid #C0C4CC"
},

//失去焦點驗證輸入的是否為number類型的
verifyNumber(val, event) {
  if (parseInt(val)) {
    this.warningInfo = ""
  } else {
    let input = event.currentTarget
    input.placeholder = "請輸入數字"
    input.value = ""
    input.style.border = "1px solid #DC143C"
  }
},