//取cookies       
function getCookie(name) 
{
    var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
    if (arr != null)
        return unescape(arr[2]);
    return null;
}
//设置cookies 两个参数，一个是cookie的名子，一个是值
function SetCookie(name, value, time)  
{
    var exp = new Date();
    exp.setDate(exp.getDate() + time);
    document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
}
//删除cookie
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();
}

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