图片缩放效果--IE和火狐兼容模式

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

 <head>

 <meta http-equiv = "Content-Type" content="text/html;charset=gb2312"/>

  <title> 图片放大缩小</title>

  <meta name="Generator" content="EditPlus">

  <meta name="Author" content="">

  <meta name="Keywords" content="">

  <meta name="Description" content="">

<style>

  .one{width:90px;height:100px}

  </style>

<script language="javascript">

window.onload=function(){

	var img1 = document.getElementsByTagName("img")[0];

	//火狐和IE兼容的获得元素属性

	/*function getsize(obj,att){

		if(document.all){

			return obj.currentStyle[att];

		}

		else{

			return getComputedStyle(obj,att)[att];

		}

	}

	alert(getsize(img1,"width"));

	*/

	//火狐和IE兼容的获得鼠标滚轮信息

if(img1.addEventListener){

	img1.onmousewheel = scrollfun;

	img1.addEventListener("DOMMouseScroll",scrollfun,false);

	}

	function scrollfun (e){

		var ev= e || window.event;//兼容分别为IE和火狐

		var num=ev.wheelDelta||ev.detail;//兼容分别为IE和火狐

		//alert(num);

		if((num== -3 || num ==120) && img1.offsetWidth < 900){

			img1.style.width = (img1.offsetWidth)*1.2 +"px";

			img1.style.height = (img1.offsetHeight)*1.2 +"px";

		}

		else if((num ==3 || num ==-120) && img1.offsetWidth >60){

			img1.style.width =(img1.offsetWidth)/1.2 + "px";

			img1.style.height = (img1.offsetHeight)/1.2+ "px";

		}

		}

}



</script>

 </head>

<!--"D:/Myfile/图片/1.jpg"-->

 <body>

  <img src="file:///D|/1.jpg" class="one"/>

 </body>

</html>

  

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