手写一个移动端进度条

HTML：

<input type="range" />
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CSS：

/*横条样式*/
input[type='range'] {
    -webkit-appearance: none; /* 清除系统默认样式 */
    background: linear-gradient(to right, #f00, #f00) no-repeat, #000; /*设置背景渐变色*/
    background-size: 50% 100%; /* 设置左右宽度比例 */
    width: 100%;
    height: 20px;
    border-radius: 10px;
    transition: height 0.3s, border-radius 0.3s;
}
input[type='range'].active {
    height: 30px;
    border-radius: 15px;
}
input[type='range'].dragging {
    height: 40px;
    border-radius: 20px;
}

/*拖动块的样式*/
input[type='range']::-webkit-slider-thumb {
    -webkit-appearance: none; /* 清除系统默认样式 */
    height: 26px;
    width: 26px;
    background: #fff;
    border-radius: 50%;
    border: solid 1px #ddd;
    transition: height 0.3s, width 0.3s;
}
input[type='range'].active::-webkit-slider-thumb {
    height: 38px;
    width: 38px;
    border: solid 1px #f00;
}
input[type='range'].dragging::-webkit-slider-thumb {
    height: 50px;
    width: 50px;
    border: solid 1px #f00;
}
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JS：

const input = document.querySelector('input');
const activeTimer = (() => {
    let timer = null;
    return {
        clear: () => {
            if (timer) {
                clearTimeout(timer);
                timer = null;
            }
        },
        set: () => {
            timer = setTimeout(() => {
                input.classList.remove('active');
            }, 2000);
        },
    };
})();

input.addEventListener('input', event => {
    const target = event.target;
    const value = target.value;
    console.log('target value', value);
    target.style.backgroundSize = `${value}% 100%`;
});

input.addEventListener('touchstart', event => {
    const target = event.target;
    target.classList.add('active');

    activeTimer.clear();
    activeTimer.set();
});

input.addEventListener('touchmove', event => {
    activeTimer.clear();

    const target = event.target;
    target.classList.remove('active');
    target.classList.add('dragging');
});

input.addEventListener('touchend', event => {
    const target = event.target;
    target.classList.remove('dragging');
    target.classList.add('active');

    activeTimer.clear();
    activeTimer.set();
});
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