感知刷新页面是否有未提交的数据

<script language="javascript" type="text/javascript">

var unloadConfirm={};

unloadConfirm.MSG = "有数据还未保存！！！";

unloadConfirm.set = function(a) {

 window.onbeforeunload = function(b) {

 if($(".not_submit").size()){//自定义的class，标记未提交的数量

    b = b||window.event;

    b.returnValue = a;

    return a

 }

}

};

unloadConfirm.clear = function() { 

 window.onbeforeunload = function(){}

};

//alert($(".not_submit").size());

unloadConfirm.set(unloadConfirm.MSG);

</script>