js实现图片放大缩小，点击放大按钮不松鼠标，图片会不断的逐渐放大，当然也可以点一下放大一点，点击缩小按钮则反之，具体代码如下：
<html xmlns="https://www.feishuai.vip/php-function/1000.html">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>javascript控制图片缩小或者放大</title>
</head>
<body>
<script type="text/javascript">
var oTime;
function changeSize(id,action{
var obj=document.getElementById(id;
obj.style.zoom=parseInt(obj.style.zoom+(action=='+'?+10:-10+'%';
oTime=window.setTimeout('changeSize(\''+id+'\',\''+action+'\'',100;
}
document.onmouseup=function({
window.clearTimeout(oTime;
}
</script>
<div style="height: 200px; overflow: auto;">
<img id="headImg" src="https://www.feishuai.vip/images/logo.gif" width="67" height="55" style="zoom: 100%;"></div>
<button onmousedown="changeSize('headImg','+';" onmouseup="window.clearTimeout(oTime;">放大</button>
<button onmousedown="changeSize('headImg','-';" onmouseup="window.clearTimeout(oTime;">缩小</button>
</body>
</html>