清除cookie

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// 清除所有的cookie
function deleteCookie() {
    var cookies = document.cookie.split(";");
    for (var i = 0; i < cookies.length; i++) {
        var cookie = cookies[i];
        var eqPos = cookie.indexOf("=");
        var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
        document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
    }
    if(cookies.length > 0)
    {
        for (var i = 0; i < cookies.length; i++) {
            var cookie = cookies[i];
            var eqPos = cookie.indexOf("=");
            var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
            var domain = location.host.substr(location.host.indexOf('.'));
            document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/; domain=" + domain;
        }
    }
}