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jQuery implementation of skin-changing function based on cookies

韦小宝

Jan 12, 2018 am 09:56 AM

cookie ie jquery

This article mainly introduces jQuery's skin-changing function based on cookies. It analyzes the operation method of jQuery using cookies to record and read user information to implement page styles based on specific examples. Friends who are interested in jQuery can refer to this article. Article

The example in this article describes how jQuery implements the skin-changing function based on cookies. Share it with everyone for your reference, the details are as follows:

Skin change, you can always see these two words (also called skin) when you use QQ, browser, Kugou and other software. However, skin changing can indeed solve the tastes of many people. Skin changing may seem like an insignificant function, but it can actually attract users. Okay, without further ado, let’s start class.

Attach my code:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>cookie的使用</title>
<script type="text/javascript" src="js/jquery-1.8.3.js"></script>
<style>
.huanFu{
  float:right;
}
.huanFu ul li{
  width:30px;height:30px;
  list-style:none;
  margin:0 5px;
  float:left;
  cursor:pointer;
  border:1px solid #000;
}
.fu1{background-color:#F00;}
.fu2{background-color:#0F0;}
.fu3{background-color:#00F;}
.fu4{background-color:#FF0;}
.huanFu ul li.select{border:3px solid #000;margin-top:-3px;}
</style>
<script>
$(function(){
  var cookieClass=getCookie(&#39;class&#39;);//读取本地的Cookie
  if(cookieClass){
    $("body").attr("class",cookieClass);//把页面的背景恢复成Cookie保存的颜色
  }else{
    $("body").attr("class","fu1");
  }
  $(".huanFu ul li").on("click",function(){
    $(this).addClass("select").siblings().removeClass("select");//标示出选中的样式
    var fuName=$(this).attr("fuName");//取得class名。讲解:起了一个fuName属性,在里面存了fu1,现在取出来而已
    $("body").attr("class",fuName);//改变body的class属性来达到背景换色的效果
    function SetCookie(name,value,day){//三个传值,名字、值、保存天数
      var exp = new Date();//取得本机当前时间(含日期)
      exp.setTime(exp.getTime() + day*24*60*60*1000);//把天数变成毫秒保存起来
      document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();//以name=fu1;expires=Date {Thu Jun 26 2014 23:23:25 GMT+0800}这一长串的字符串保存到本机的cookie中
    }
    SetCookie("class",fuName,7);//设置Cookie过程
  });
  function getCookie(name){//读取本地的Cookie过程
    var nameTit=name+"=";//此时的name值就是"class",nameTit="class="
    var ca=document.cookie.split(&#39;;&#39;);//读取本地cookie的内容是"xxx.xxx;xxx.xxx",所以我们去掉&#39;;&#39;后，它会以数组的形式保存入ca内。
    for(var i=0;i<ca.length;i++){//循环ca数组
      var c=ca[i];
      while(c.charAt(0)==&#39; &#39;){//如果开头第一个字符是空格的话，读取就从第二位到最后一位
        c=c.substring(1,c.length);
      }
      if(c.indexOf(nameTit)==0){//判断是否存在,并是否第一位开始的"class="
        return c.substring(nameTit.length,c.length);//取得class=fu1中的"fu1"
      }
      return null;
    }
  }
});
</script>
</head>
<body class="fu1">
  <p class="huanFu">
    <ul>
      <li class="fu1" fuName="fu1"></li>
      <li class="fu2" fuName="fu2"></li>
      <li class="fu3" fuName="fu3"></li>
      <li class="fu4" fuName="fu4"></li>
    </ul>
  </p>
</body>
</html>

Copy after login

After understanding the above code, copy it to your editing software to see the effect. Click the color block in the upper right corner, and the background color of the page changes to the color corresponding to the color block. Then close your browser and open the page again. Are you surprised to find that the color is the color you last closed the browser. I have added corresponding comments in the code. Although the script code is long, it is actually very easy to understand. It uses the browser's cookie to save your value and record your color selection at all times.

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Detailed explanation of JavaScript to obtain cookies and delete cookies

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