jQuery implements a method of changing the background of a web page by writing cookies

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jQuery implements a method of changing the background of a web page by writing cookies_jquery

May 16, 2016 pm 03:05 PM

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The example in this article describes how jQuery changes the background of a web page by writing cookies. Share it with everyone for your reference, the details are as follows:

&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
&lt;head&gt;
&lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt;
&lt;title&gt;jquery更换网页背景（写入cookie）&lt;/title&gt;
&lt;style type="text/css"&gt;
 body,p,ul{margin:0;padding:0;}
 ul{float:right;height:40px;margin-top:20px;margin-right:20px;}
 ul li{list-style-type:none;float:left;width:20px;height:20px;margin-left:10px;cursor:pointer;}
 .skin{height:40px;position:fixed;background:#fff;border-bottom:solid 1px #cccc;top:0;left:0;width:100%;}
 .red{background:#F06;}/*红色*/
 .black{background:#000;}/*黑色*/
 .blue{background:#09F;}/*蓝色*/
 .green{background:#093;}/*绿色*/
&lt;/style&gt;
&lt;script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.8.2/jquery.min.js"&gt;&lt;/script&gt;
&lt;script type="text/javascript"&gt;
 $(document).ready(function(){
   //为了安全 google chrome 等浏览器是禁止本地文件写Cookie的即file:///F:/Lord%20community/lrtk/Untitled-2.html这样的以file开头的是不能写本地文件的
   var cookieClass = getCookie('class');//读取需要缓存的对象。
   $("body").attr("class",cookieClass);//
   $(".skin_list li").each(function(){
     $(this).click(function(){       
       var className=$(this).attr("class");//保存当前选择的类名
       $("body").attr("class",className,30);//把选中的类名给body
       function SetCookie(name,value,day)//两个参数，一个是cookie的名子，一个是值
       {
        var exp = new Date(); //new Date("December 31, 9998");
        exp.setTime(exp.getTime() + day*24*60*60*1000);
        document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
       }
       SetCookie("class",className,30);
     })
    });
   });
   function getCookie(name)//取cookies函数  
   {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i &lt; ca.length;i++) {
     var c = ca[i];
     while (c.charAt(0)==' ') c = c.substring(1,c.length);
     if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
   }
&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div class="skin"&gt;&lt;ul class="skin_list"&gt;&lt;li style="width:100px;text-align:right;"&gt;更换背景：&lt;/li&gt;&lt;/li&gt;&lt;li class="red"&gt;&lt;/li&gt;&lt;li class="black"&gt;&lt;/li&gt;&lt;li class="blue"&gt;&lt;/li&gt;&lt;li class="green"&gt;&lt;/li&gt;&lt;/ul&gt;&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;

Copy after login

Readers who are interested in more jQuery-related content can check out the special topics on this site: "JQuery cookie operation skills summary", "jQuery table (table) operation skills summary" , "Summary of jQuery drag effects and techniques", "Summary of jQuery extension techniques", "Summary of jQuery common classic special effects", "jQuery animation and special effects usage summary", "jquery selector usage summary" and "jQuery common plug-ins and usage summary"

I hope this article will be helpful to everyone in jQuery programming.

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