javascript 操作cookie

//设置cookie
function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
    var expires = "expires=" + d.toGMTString();
    document.cookie = cname + "=" + cvalue + "; " + expires;
}

//获取cookie
function getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i].trim();
        if (c.indexOf(name) == 0) { return c.substring(name.length, c.length); }
    }
    return "";
}

//删除cookie
function delCookie(cname) {
    setCookie(cname, "", -1);
}

//检测cookie
function checkCookie(key) {
    var user = getCookie(key);
    if (user != "") {
        return 1;
    } else {
        return 0;
    }
}