js 取得圖片大小

<script src="scripts/jquery.js" type="text/javascript"></script> 
<div>
<div id="getUrlPicHeight" style="display:block;"><img src=""  /></div>
</div>
<button id="sory">按這裏</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(["圖片大小是:",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>