如何制作广告视频播放器

Question

我想制作一个广告视频播放器，在其中可以在24小时内循环播放一组广告 让我们以这个json为例

var elements = '{"ads":[' +
                '{"id":"1","name":"a","duration":"5","times":"6" },' +
                '{"id":"2","name":"b","duration":"7","times":"2" },' +
                '{"id":"3","name":"c","duration":"9","times":"4" },'+
                '{"id":"4","name":"d","duration":"12","times":"1" },'+
                '{"id":"5","name":"e","duration":"5","times":"5" }]}';

所以我需要至少显示6次广告“ a”，依此类推，在其余时间中，我需要在这些广告之间添加默认广告“ h”

这是我给的一个小开始，但它没有从JSON接收数据

function roundRobinRepeat(elems, repeats) {
        var l = repeats.reduce((x, y) => x + y);
        var w = Array(l), i = j = r = 0;
        while (i < l) {
            if (repeats[j] > r) w[i++] = elems[j];
            j = (j + 1) % elems.length;
            if (j === 0) r++;
        }
        return w;
    }

    document.getElementById("output").innerHTML = "Output: " + roundRobinRepeat(
        ["a", "b", "c", "d", "e"], 
        [ 6,   2,   4,   1 , 5]
    ).join(" ");