js에서 음악 재생 컨트롤 바를 구현하는 방법

<p class="audio">
    <audio></audio>
    <p class="audio-controller">
        <span class="audio-prev"></span>
        <span class="audio-state"></span>
        <span class="audio-next"></span>
     </p>
     <p class="audio-bar">
        <span class="audio-time-current"></span>
        <p class="audio-progress">
            <p>
                <p></p>
                <p></p>
                </p>
            </p>
        <span class="audio-time-duration"></span>
     </p>
     <p class="audio-volume">
        <span class="audio-volume-icon"></span>
        <p class="audio-volume-adjust">
            <p>
                <p></p>
                <p></p>
            </p>
        </p>
     </p></p>

// 最外层作为js에서 음악 재생 컨트롤 바를 구현하는 방법暗的长度区域<p>    // 最内层是实际表示进度
    <p></p>
</p>

    // 滑动js에서 음악 재생 컨트롤 바를 구현하는 방법
    bar.addEventListener('mousedown', function(e) {
        e.stopPropagation();        // 获取滑块被选择时相对文档的初始X轴值
        options.clientX = e.clientX;        // 偏移量
        options.left = this.offsetLeft;
        options.max = bgNode.offsetWidth - this.offsetWidth / 2;
        options.isDrag = true;
    });
    document.addEventListener('mousemove', function(e) {
        e.stopPropagation();        if (options.isDrag) {            let currentClientX = e.clientX,
                left = options.left,
                max = options.max,
                initClientX = options.clientX,
                barHalfWidth = bar.offsetWidth / 2,
                fgWidth = 0,                // 设置要滑动到的位置点(x轴方向偏移量)
                to = Math.max(0, Math.min(max, left + (currentClientX - initClientX)));

            bar.style.left = to + 'px';            if (to > barHalfWidth) {
                fgWidth = to + barHalfWidth;
            }
            fgNode.style.width = Math.max(0, fgWidth) + 'px';
            options.offsetX = Math.max(0, fgWidth);
        }
    });

    bgNode.parentNode.addEventListener('mouseup', function(e) {
        e.stopPropagation();        if (options.isDrag) {            // 绘制此时的进度
            tools.timeUpdateOrVolumeUpdate(options.offsetX, type);
            options.isDrag = false;
        }
    });