js 取得图片大小

<script src="scripts/jquery.js" type="text/javascript"></script>
<div>
<div id="getUrlPicHeight" style="display:block;"><img src=""  /></div>
</div>
<button id="sory">按这里</button>
<input id="ssssss" type="text"/>
<script  type="text/javascript">

$(function(){
var loadBigPicToBody=function(picUrl){
$('img',$("#getUrlPicHeight")).attr('src',picUrl);
}
$("#sory").on("click",function(){

var image = new Image();
image.src = $("#ssssss").val()+'?'+getTimeStamp();
image.onreadystatechange=function(){
if (image.readyState=="complete" || image.readystate=="loaded") {
alert(["图片大小是:",image.width,image.height]);
}
}

})

})
function getTimeStamp(){
var d,s;
d=new Date();
s=d.getFullYear().toString();
s+=(Number(d.getMonth())+1).toString();
s+=d.getHours().toString();
s+=d.getMinutes().toString();
s+=d.getSeconds().toString();
return s;
}

</script>