代码中的now，即是当前时间。 

var now = getNow();


function getNow() {
    var d = new Date();
    var year = d.getFullYear();
    var month = change(d.getMonth() + 1);
    var day = change(d.getDate());
    var hour = change(d.getHours());
    var minute = change(d.getMinutes());
    var second = change(d.getSeconds());

    function change(t) {
        if (t < 10) {
            return "0" + t;
        } else {
            return t;
        }
    }
    var time = year + '年' + month + '月' + day + '日 ' + hour + '时' + minute + '分' + second + '秒';
    return time;
}