★JavaScript图片放大缩小还原功能实现代码★

2014-11-03 02:43:53 -0500

[代码收集]★JavaScript图片放大缩小还原功能实现代码★

2014-06-21 06:47:34 +0800

★JavaScript图片放大缩小还原功能实现代码★

html代码

<html>
 <body>
 <textarea >
<script type="text/javascript"> 
// 放大缩小控制 
var PhotoSize = { 
zoom: 0, // 缩放率 
count: 0, // 缩放次数 
cpu: 0, // 当前缩放倍数值 
elem: "", // 图片节点 
photoWidth: 0, // 图片初始宽度记录 
photoHeight: 0, // 图片初始高度记录 
init: function(){ 
this.elem = document.getElementById("focusphoto"); 
this.photoWidth = this.elem.scrollWidth; 
this.photoHeight = this.elem.scrollHeight; 
this.zoom = 1.2; // 设置基本参数 
this.count = 0; 
this.cpu = 1; 
}, 
action: function(x){ 
if(x === 0){ 
this.cpu = 1; 
this.count = 0; 
}else{ 
this.count += x; // 添加记录 
this.cpu = Math.pow(this.zoom, this.count); // 任意次幂运算 
}; 
this.elem.style.width = this.photoWidth * this.cpu +"px"; 
this.elem.style.height = this.photoHeight * this.cpu +"px"; 
} 
}; 
// 启动放大缩小效果 用onload方式加载，防止第一次点击获取不到图片的宽高 
window.onload = function(){PhotoSize.init()}; 
</script> 
 <img id="focusphoto" src="http://files.jb51.net/upload/201107/20110713233007487.jpg" /> 
<div>
<input type="button" value="放大" onclick="PhotoSize.action(1);" /> <input type="button" value="缩小" onclick="PhotoSize.action(-1);" /> <input type="button" value="还原大小" onclick="PhotoSize.action(0);" /> <input type="button" value="查看当前倍数" onclick="alert(PhotoSize.cpu);" /></div>

代码演示

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