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//取cookies函数
function getCookie(name){
var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
if (arr != null) return unescape(arr[2]); return null;
}
//两个参数,一个是cookie的名子,一个是值
function setCookie(name,value){
var Days = 1;//此 cookie 将被保存 1 天
var exp = new Date();//new Date("December 31, 9998");
exp.setTime(exp.getTime() + 30*60*1000);
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
// 删除cookies
function delCookie(name){
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=getCookie(name);
if(cval!=null)
document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}