js清除所有的cookie

//清除所有cookie函数
function clearAllCookie() {
    var keys = document.cookie.match(/[^ =;]+(?=\=)/g);
    if (keys) {
        for (var i = keys.length; i--;)
            document.cookie = keys[i] + '=0;expires=' + new Date(0).toUTCString()
    }
}