获取类名 封装 getStyle

div{
				width:100px;
				height:100px;
				background:red;
			}

　　

<div></div>

　　

<script type="text/javascript">
			var oDiv = document.getElementsByTagName("div")[0];
			oDiv.style.cssText = "width:100px;height:100px;background:red;";
//			alert(oDiv.style.width);
			
			function getStyle(obj,attr){
				if(obj.currentStyle){
					return obj.currentStyle[attr];
				}else{
					return getComputedStyle(obj)[attr];
				}
			}
			alert(getStyle(oDiv,"width"));
			
			var time1 = setInterval(function(){
				alert(1);
			},1000)
			var time2 = setTimeout(function(){
				alert(2);
			},1000)
			clearInterval(time1);
			clearTimeout(time2);
		</script>