js 关闭窗口时判断表单数据是否改变

//关闭当前窗口,非刷新

<script type="text/javascript">

var value1 = $("#id1").val();

var value2 = $("#id2").val();

window.onbeforeunload = function(){

if(event.clientY < 0 && event.clientX > document.body.clientWidth - 20

|| event.clientY < 0 && event.clientX < 20

|| event.altKey || event.ctrlKey

|| event.clientY > document.body.clientHeight){

var value11 = $("#id1").val();

var value22 = $("#id2").val();

if((value1 != value11 || value2 != value22)){

return "当前数据未保存,确定要离开吗?";

}

}

}

</script>