JS读写COOKIE的方法

设置

var Cookies = {};
//设置Cookies
Cookies.set = function(name, value)
{
    var argv = arguments;
    var argc = arguments.length;
    var expires = (argc > 2) ? argv[2] : null;
    var path = (argc > 3) ? argv[3] : '/';
    var domain = (argc > 4) ? argv[4] : null;
    var secure = (argc > 5) ? argv[5] : false;
    document.cookie = name + "=" + escape (value) +
                                          ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
                                          ((path == null) ? "" : ("; path=" + path)) +
                                          ((domain == null) ? "" : ("; domain=" + domain)) +
                                          ((secure == true) ? "; secure" : "");
};

读取

//读取Cookies
Cookies.get = function(name)
{
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    var j = 0;
    while(i < clen)
    {
        j = i + alen;
        if (document.cookie.substring(i, j) == arg)
        return Cookies.getCookieVal(j);
        i = document.cookie.indexOf(" ", i) + 1;
        if(i == 0)
        break;
    }
    return null;
};

清除

//清除Cookies

Cookies.clear = function(name)
{
    if(Cookies.get(name))
    {
        var expdate = new Date(); 
        expdate.setTime(expdate.getTime() - (86400 * 1000 * 1)); 
        Cookies.set(name, "", expdate); 
    }
};

Cookies.getCookieVal = function(offset)
{
    var endstr = document.cookie.indexOf(";", offset);
    if(endstr == -1)
    {
        endstr = document.cookie.length;
    }
    return unescape(document.cookie.substring(offset, endstr));
};