JavaScript 简单实现网页换肤功能

HTML 与 JavaScript 核心代码

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title></title>
    <link id="changelink" rel="stylesheet" href="css/default.css" rel="external nofollow" />
  </head>
  <body>
    <script>
      
      var csslink = document.getElementById("changelink");
      
      //初始化主题
      loadtheme();
      
      function changetheme(color){
        csslink.href = "css/"+color+".css";
        //保存主题到cookies
        document.cookie="theme="+color;
      }
      
      function loadtheme(){
        //从cookies读取主题
        var themevalue=document.cookie.split(";")[0].split("=")[1];
        if(themevalue==null){
          csslink.href = "css/default.css";
        }else{
          csslink.href = "css/"+themevalue+".css";
        }
      }
      
    </script>
    <button onclick="changetheme('default')">默认</button>
    <button onclick="changetheme('red')">红色</button>
    <button onclick="changetheme('green')">绿色</button>
  </body>
</html>

CSS 样式定义

body{
  background: #ffffff;
}

body{
  background: #ff0000;
}

body{
  background: #008000;
}