js清除所有cookie

//清除所有cookie函數
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()
    }
}