JS cookie操作

function clearCookie() {
    if (document.cookie == '') {
        console.log('clear done!');
        return;
    }
    var cookieEntries = document.cookie.split(';');
    for (var i = 0; i < cookieEntries.length; i++) {
        var name = cookieEntries[i].split('=')[0];
        var exp = new Date();
        exp.setTime(exp.getTime() - 1);
        document.cookie = name + "=1"  + ";expires=" + exp.toGMTString();
    }
}