用javascript来实现页面的换肤功能
js实现换肤功能的实现主要是通过利用js控制CSS来实现的。大致的实现原理是这样的,
1、先定义一个页面基本样式style.css来确定div的宽高等属性,使得整个页面的DIV元素有一个基本的框架结构。
2、再定义一系列的样式color1.css,color2.css……用来确定DIV元素的背景颜色,边框颜色等等。
3、用JS函数来决定调用哪个样式,并把调进来的样式写进cookie,这样就可以达功能。
例如:我们的页面结构如下:
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<div id="header"></div>
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<div id="contant"></div>
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<div id="footer"></div>
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style.css
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#header{width:700px;height:120px; margin:0px auto;}
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#contant{width:700px;height:400px; margin:0px auto;}
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#footer{width:700px;height:200px; margin:0px auto;}
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color1.css
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#header,#contant,#footer{boder:1px solid #dfaf33; background-color:#eeeeee;}
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color2.css
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#header,#contant,#footer{boder:1px solid #ff00ea; background-color:#ff3322;}
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页面中这两行比较关键:
<link href="css/style.css" rel="stylesheet" type="text/css" />
<link href="css/color1.css" id="color" rel="stylesheet" type="text/css" />
第1行引入页面的基本样式,第2行引入一个颜色样式color2.css给页面一个初始化颜色,第2行中有一个id="color"这个很关键它为JS函数提供了
接口,js通过这个id改变href的值来决定引入那个颜色样式,从而达到改变页面颜色样式的目的。
改变颜色样式的按钮我们可以用文字链接来实现,也可以用其他元素来实现。
<a onclick="changeStyle(1)">样式1</a>
<a onclick="changeStyle(2)">样式2</a>
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实现这些功能的js函数:
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function getObject(elementId) { //获取指定id的object
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if (document.getElementById) {
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return document.getElementById(elementId);
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} else if (document.all) {
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return document.all[elementId];
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} else if (document.layers) {
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return document.layers[elementId];
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}
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}
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function changeStyle(id){//切换样式
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var stylesheet=getObject("color").href="css/color"+id+".css";
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document.cookie="stylesheet="+escape(stylesheet);//写入Cookie
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//alert(document.cookie);
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//alert(stylesheet);
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}
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function initStyle(){ //初始化样式,如果cookie存在样式,则加载cookie样式,否则加载默认样式
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if(/stylesheet=([^;]+)/.test(document.cookie))//判断是否存在cookie.
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getObject("color").href=unescape(RegExp.$1);
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//alert(/stylesheet=([^;]+)/.test(document.cookie));
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}
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initStyle();
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原文出处:http://www.cnblogs.com/38809972/articles/952115.html
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