<!DOCTYPE HTML>
<html>
<head>
<title>改变图片的大小</title>
<meta charset="utf-8"/>
<script>
var initWidth,initHeight;
function initPic(){
initWidth = document.myPic.width;
initHeight = document.myPic.height;
}
function changePic(num){
document.myPic.width = initWidth*num;
document.myPic.height = initHeight*num;
}
</script>
</head>
<body onload="initPic()">
<img src="images/1.jpg" name="myPic"/>
<form>
<input type="radio" value="0.8" onClick="changePic(this.value)">80%
<input type="radio" value="1" onClick="changePic(this.value)">100%
<input type="radio" value="1.2" onClick="changePic(this.value)">120%
</form>
</body>
</html>
