JS面向对象封装，判空判重

最近看网课，学了一点JS，面向对象。感谢杜老师！

egvo.js

//定义表单项类型
FormItem=function(lable,id){
    this.lable=lable;
    this.id=id;
}
//工具类
EGOV=function(){
    //验证非空
    this.isNotEmpty=function(formItemArr){
        for(var i=0;i<formItemArr.length;i++){
            var formItem=formItemArr[i];
            var id=formItem.id;
            var lable=formItem.lable;
            var domObj=document.getElementById(id);
            if(domObj.value == ""){
                alert(lable+"不能为空，请填写");
                domObj.focus();
                return false;
                
            }
        }
        return true;
    }
    //验证一致性(程序运行的时候formItem1和fornItem2都是FormItem类型的对象)
    this.isSame=function(formItem1,FormItem){
          var id1=formItem1.id;
          var lable1=formItem1.label;
          var domobj1=document.getElementById(id1);
          
          var id2=formItem2.id;
          var lable2=formItem2.label;
          var domobj2=document.getElementById(id2);
          
          if(domobj1.value !=domobj2.value){
              alert(lable1 + "和" +lable2 +"不一致，请重新填写");
              domobj1.value="";
              domobj2.value="";
              domobj1.focus();
              return false;
          }
          return false;
    }
}

var $=new EGOV();

引用的时候：

<script src="js/egov.js"></script>
<script>
function doUpdate(){
    var ok=validataForm();
    if(ok){
        document.forms["userForm"].submit();
    }
}
function validataForm(){
    var formItem1=new FormItem("用户姓名","username");
    var formItem2=new FormItem("用户密码","userpswd");
    var formItem3=new FormItem("用户类型","orgtype");
    var formItemArr=[formItem1,formItem2,formItem3];
    
    return $.isNotEmpty(formItemArr);
}

</script>