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    /**
 * jquery cookie插件
 * 使用：
 * $.cookie('key'); //读取Cookie值
 * $.cookie('key', 'value'); // 设置/新建cookie的值
 * $.cookie('key', 'value', {expires: 7, path: '/', domain: 'dh89.com', secure: true});//新建一个cookie 包括有效期(天数) 路径 域名等
 * $.cookie('key', null); //删除一个cookie
 */
jQuery.cookie = function (name, value, options) { if (typeof value != "undefined") { 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(); } 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 { 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]); if (cookie.substring(0, name.length + 1) == (name + "=")) { cookieValue = decodeURIComponent(cookie.substring(name.length + 1)); break; } } } return cookieValue; } };