jquery.cookie中的操作之与换肤-白红宇

jquery.cookie中的操作之与换肤

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发布时间：2019-06-06

本文共 9970 字，大约阅读时间需要 33 分钟。

jquery.cookie.js的插件，插件的源代码如下：

/** * Cookie plugin * * Copyright (c) 2006 Klaus Hartl (stilbuero.de) * Dual licensed under the MIT and GPL licenses: * http://www.opensource.org/licenses/mit-license.php * http://www.gnu.org/licenses/gpl.html * *//** * Create a cookie with the given name and value and other optional parameters. * * @example $.cookie('the_cookie', 'the_value'); * @desc Set the value of a cookie. * @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true }); * @desc Create a cookie with all available options. * @example $.cookie('the_cookie', 'the_value'); * @desc Create a session cookie. * @example $.cookie('the_cookie', null); * @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain *       used when the cookie was set. * * @param String name The name of the cookie. * @param String value The value of the cookie. * @param Object options An object literal containing key/value pairs to provide optional cookie attributes. * @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object. *                             If a negative value is specified (e.g. a date in the past), the cookie will be deleted. *                             If set to null or omitted, the cookie will be a session cookie and will not be retained *                             when the the browser exits. * @option String path The value of the path atribute of the cookie (default: path of page that created the cookie). * @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie). * @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will *                        require a secure protocol (like HTTPS). * @type undefined * * @name $.cookie * @cat Plugins/Cookie * @author Klaus Hartl/klaus.hartl@stilbuero.de *//** * Get the value of a cookie with the given name. * * @example $.cookie('the_cookie'); * @desc Get the value of a cookie. * * @param String name The name of the cookie. * @return The value of the cookie. * @type String * * @name $.cookie * @cat Plugins/Cookie * @author Klaus Hartl/klaus.hartl@stilbuero.de */jQuery.cookie = function(name, value, options) {    if (typeof value != 'undefined') { // name and value given, set cookie        options = options || {};        if (value === null) {            value = '';            options.expires = -1;        }        var expires = '';        if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {            var date;            if (typeof options.expires == 'number') {                date = new Date();                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));            } else {                date = options.expires;            }            expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE        }        // CAUTION: Needed to parenthesize options.path and options.domain        // in the following expressions, otherwise they evaluate to undefined        // in the packed version for some reason...        var path = options.path ? '; path=' + (options.path) : '';        var domain = options.domain ? '; domain=' + (options.domain) : '';        var secure = options.secure ? '; secure' : '';        document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');    } else { // only name given, get cookie        var cookieValue = null;        if (document.cookie && document.cookie != '') {            var cookies = document.cookie.split(';');            for (var i = 0; i < cookies.length; i++) {                var cookie = jQuery.trim(cookies[i]);                // Does this cookie string begin with the name we want?                if (cookie.substring(0, name.length + 1) == (name + '=')) {                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));                    break;                }            }        }        return cookieValue;    }};

Cookie插件的操作

创建一个会话cookie：

$.cookie(‘cookieName’,'cookieValue’);

注：当没有指明cookie时间时，所创建的cookie有效期默认到用户浏览器关闭止，故被称为会话cookie。

创建一个持久cookie：

$.cookie(‘cookieName’,'cookieValue’，｛expires：7｝);

注：当指明时间时，故称为持久cookie，并且有效时间为天。

创建一个持久并带有效路径的cookie：

$.cookie(‘cookieName’,'cookieValue’，｛expires：7，path：’/'｝);

注：如果不设置有效路径，在默认情况下，只能在cookie设置当前页面读取该cookie，cookie的路径用于设置能够读取cookie的顶级目录。

创建一个持久并带有效路径和域名的cookie：

$.cookie(‘cookieName’,'cookieValue’，｛expires：7，path：’/'，domain: ‘chuhoo.com’，secure: false，raw:false｝);

注：domain：创建cookie所在网页所拥有的域名；secure：默认是false，如果为true，cookie的传输协议需为https；raw：默认为false，读取和写入时候自动进行编码和解码（使用encodeURIComponent编码，使用decodeURIComponent解码），关闭这个功能，请设置为true。

获取cookie：

$.cookie(‘cookieName’); //如果存在则返回cookieValue，否则返回null。

删除cookie：

$.cookie(‘cookieName’,null);

或者这样也能删除： $.cookie('cookieName', '', { expires: -1, path: '/' }); // 删除 cookie

注：如果想删除一个带有效路径的cookie，如下：$.cookie(‘cookieName’,null,{path:’/'});

来演示一个换肤的粟子：

代码之div+css


      
     
         
      Jane Shopping    
              
       蓝色
        
       紫色
        
       红色
        
       天蓝色
        
       橙色
        
       淡绿色

/*切换皮肤样式*/#skin {     float:right;     margin:10px;     padding:4px;     width:120px;     list-style:none;     border: 1px solid #CCCCCC;     background:#FFF;}#skin li {     float:left;     margin-right:4px;     width:15px;     height:15px;     text-indent:-9999px;     overflow:hidden;     display:block;     cursor:pointer;     background-image:url(../images/theme.gif); }#skin_0 { background-position:0px 0px; }#skin_1 { background-position:15px 0px; }#skin_2 { background-position:35px 0px; }#skin_3 { background-position:55px 0px; }#skin_4 { background-position:75px 0px; }#skin_5 { background-position:95px 0px; }#skin_0.selected { background-position:0px 15px; }#skin_1.selected { background-position:15px 15px; }#skin_2.selected { background-position:35px 15px; }#skin_3.selected { background-position:55px 15px; }#skin_4.selected { background-position:75px 15px; }#skin_5.selected { background-position:95px 15px; }

不同皮肤的css文件都放在styles/skins 文件夹下，命名如下：

代码之jQuery代码

版本一：

$(function(){            var $li =$("#skin li");            $li.click(function(){                $("#"+this.id).addClass("selected")                //当前元素选中                            .siblings().removeClass("selected");  //去掉其它同辈
元素的选中                $("#cssfile").attr("href","styles/skin/"+ (this.id) +".css"); //设置不同皮肤                $.cookie( "MyCssSkin" ,  this.id , { path: '/', expires: 10 });            });            var cookie_skin = $.cookie( "MyCssSkin");//将MyCssSkin这个cookie值this.id赋给变量cookie_skin　　　　　　　　if (cookie_skin) {                    $("#"+cookie_skin).addClass("selected")                //当前
元素选中                                      .siblings().removeClass("selected");  //去掉其它同辈
元素的选中                    $("#cssfile").attr("href","styles/skin/"+ cookie_skin +".css"); //设置不同皮肤                    $.cookie( "MyCssSkin" ,  cookie_skin  , { path: '/', expires: 10 });            }        })

版本一不好的地方，就是有大量的重复代码，可以模块化，函数化，来看版本二：

//网站换肤$(function(){        var $li =$("#skin li");        $li.click(function(){            switchSkin( this.id );        });        var cookie_skin = $.cookie("MyCssSkin");        if (cookie_skin) {            switchSkin( cookie_skin );        }});function switchSkin(skinName){        $("#"+skinName).addClass("selected")                //当前元素选中                       .siblings().removeClass("selected");  //去掉其他同辈
元素的选中        $("#cssfile").attr("href","styles/skin/"+ skinName +".css"); //设置不同皮肤        $.cookie( "MyCssSkin" ,  skinName , { path: '/', expires: 10 });}

下面代码也是换肤的例子

html:

    
             
      皮肤：
      藤蔓绿 
      经典蓝 
      甜蜜橙 
      淡雅灰

皮肤路径：

js代码：

var _skinId = getCookie("_skinId") ? getCookie("_skinId"):"1";function loadSkin(skinId){    writeCookie("_skinId",skinId);    top.window.location.reload();}function $(id){    return document.getElementById(id);}function loadCss(skinId,cssName){    var head = document.getElementsByTagName('head').item(0);    css = document.createElement('link');    css.href = "Skin/Skin" + skinId + "/"+cssName;    css.rel = 'stylesheet';    css.type = 'text/css';    css.id = 'loadCss';    head.appendChild(css);}function loadJs(file){    var scriptTag = document.getElementById('loadScript');    var head = document.getElementsByTagName('head').item(0);    if(scriptTag) head.removeChild(scriptTag);    script = document.createElement('script');    script.src = "../js/mi_"+file+".js";    script.type = 'text/javascript';    script.id = 'loadScript';    head.appendChild(script);}function setCookie(sKey, sValue, sDomain, sPath, sExpires, blSecure){    var sCookieStr = sKey + "=" + sValue + ";";    if (sDomain)    sCookieStr += " DOMAIN=" + sDomain + ";";    if (sPath)        sCookieStr += " PATH=" + sPath + ";";    if (sExpires)    sCookieStr += " EXPIRES=" + sExpires + ";";    if (blSecure)    sCookieStr += " SECURE";        document.cookie = sCookieStr;}function writeCookie(key,value){    var sExpires=new Date();    sExpires.setTime(sExpires.getTime()+24*60*60*1000*365);    setCookie(key,value,"","",sExpires.toGMTString(),"");     if(getCookie(key) == null)    {        alert("您的浏览器安全设置过高,不支持Cookie,请重新设置浏览器的。");    }}    function getCookie(sKey){    var sCookie = document.cookie;    if( !sCookie ) return null;        var sTag = sKey + "=";            var iBegin = sCookie.indexOf(sTag);    if (iBegin < 0)    return null;        iBegin += sTag.length;        var iEnd = sCookie.indexOf(";", iBegin);    if (iEnd < 0)    iEnd = sCookie.length;        return sCookie.substring(iBegin, iEnd);}function delCookie(sKey) {    var tNow = new Date();    setCookie(sKey, "", null, null, tNow.toGMTString(), null);}

转载于:https://www.cnblogs.com/shy1766IT/p/5189604.html

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