搞炸你妹的时候准备加个认证cookie跳转广告页面，于是就有了这篇文章。

JavaScript写cookie

    function setCookie(c_name, value, expiredays, path) {
        var exdate = new Date();
        exdate.setDate(exdate.getDate() + expiredays);
        document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString()) + ";" + ((path == null) ? "" : "path=" + escape(path));
    }
    setCookie("znm", "zhanimei.com", 24);

JavaScript读cookie

    function getCookie(c_name) {
        if (document.cookie.length > 0) {
            c_start = document.cookie.indexOf(c_name + "=");
            if (c_start != -1) {
                c_start = c_start + c_name.length + 1;
                c_end = document.cookie.indexOf(";", c_start);
                if (c_end == -1) c_end = document.cookie.length;
                return unescape(document.cookie.substring(c_start, c_end));
            }
        }
        return "";
    }

JavaScript删除cookie

    function delCookie(name) {
        var date = new Date();
        date.setTime(date.getTime() - 10000);
        document.cookie = name + "=a; expires=" + date.toGMTString() + ";path=*";
    }

JavaScript清除所有cookie

    function removeCookie() {
        var cookie = document.cookie.split(";");
        for (var i in cookie) {
            delCookie(cookie[i].substring(cookie[i].indexOf("="), 0));
        }
    }