Cookies 真的是现代 web 技术来优化用户体验的一个好东西，这里写了几个简易的函数，可以用来操作 Cookies，实现了一些基础的功能。

添加 Cookie

function addCookie(name, value, expireHours) {
    var cookieString = name + "=" + escape(value);
    if (expireHours > 0) {
        var date = new Date();
        date.setTime(date.getTime + expireHours * 3600 * 1000);
        cookieString = cookieString + "; expire=" + date.toGMTString();
    }
    document.cookie = cookieString;
}

获取 Cookie

function getCookie(cname) {
    var name = cname + "=";
    var decodedCookie = decodeURIComponent(document.cookie);
    var ca = decodedCookie.split(';');
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') {
            c = c.substring(1);
        }
        if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
}

删除 Cookie

function deleteCookie(name) {
    var date = new Date();
    date.setTime(date.getTime() - 10000);
    document.cookie = name + "=v; expire=" + date.toGMTString();
}