vue中监听input框获取焦点及失去焦点的问题

//这是html的输入框。定义了一个获取焦点，失去焦点的方法
 <input placeholder="请输入企业名称" @blur="animateWidth('company_name','blur')" @focus="animateWidth('company_name','focus')" >

   // 失去焦点和得到焦点的验证方法，name为要验证的字段名,type为blur或focus
    animateWidth(name, type) {
      if (name == "company_name") {
        if (type == "blur") {
          this.companyName.animate = false;
        } else {
          this.companyName.animate = true;
          return;
        }
        if (this.companyName.companyName.trim().length == 0) {
            this.companyName.valid = false;
            this.companyName.message = "请输入企业名称";
            return false;
        }else{
             this.companyName.valid = true;
            return true;
        }  
      } 
    },

  <i-input class="wallet-password-1" size="large"  v-model="counts" refs = "counts" placeholder="0" type="number">
                </i-input>

directives: {
    'mtfocus' (el, binding, vnode) {
      let mtinput = el.querySelector('input')
      mtinput.onfocus = function () {
       ...//如果要对节点的数据进行更改,且更改要映射到页面上,则更改可在vnode.context上进行,这样,改完之后,改变就会映射到页面
      }
      mtinput.onblur = function () {
        ...//同上理
      }
    }
  }