回车事件触发

created:function(){
  //登录添加键盘事件,注意,不能直接在焦点事件上添加回车
  let that = this;
  document.onkeydown = function (e) {
    let key = window.event.keyCode;
      if (key === 13){
      that.handleSubmit2();//方法
      }
    }
},