js实现滑动进度条

42582020-08-26 16:55:31

本文实例为大家分享了js实现滑动 进度条效果的具体代码，供大家参考，具体内容如下

进度条：

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>js滑动进度条效果</title>
    <style>
        *{margin:0;padding:0;user-select:none;}
        .progress-bar{position:relative;height:10px;width:400px;margin:200px auto;background:#ebeef5;border-radius:10px;}
        .progress-bar .pro-bar{position:absolute;left:0;height:10px;width:10px;background:#409eff;}
        .progress-bar .min-num{position:absolute;left:-20px;top:-5px;}
        .progress-bar .max-num{position:absolute;right:-40px;top:-5px;}
        .progress-bar .block {position:absolute;height:30px;width:10px;background:#ccc;top:-10px;border-radius:10px;}
        .progress-bar .block p{position:absolute;display:none;left:-20px;top:-45px;width:50px;height:30px;text-align:center;line-height:30px;background:#ccc;border-radius:20px;}
        .progress-bar .block:hover p{display:block;font-size:10%;color:#fff;background:#409eff;}
    </style>
</head>
<body>
    <p class="progress-bar">
        <span class="min-num">0</span>
        <span class="max-num">100</span>
        <p class="pro-bar"></p>
        <p class="block">
            <p>0</p>
        </p>
    </p>
</body>
<script>
(function(){
    let moveBlock = document.querySelector('.block');
    let proBar = document.querySelector('.pro-bar');
    let flag = false;
    let startX = null;
    let moveMax = (400 - 10); // 背景条宽度减去滑块的宽度
    moveBlock.onmousedown = function(e){
        startX = e.pageX;
        moveBlock.style.left ? moveBlock.style.left : moveBlock.style.left = '0px';
        let startLeft = parseInt(moveBlock.style.left);
        document.onmousemove = function(e){
            let moveX = (e.pageX - startX) > 0 ? true : false;
            let moveSection = startLeft + (e.pageX - startX);
            // 限定移动范围
            if (moveSection >= 0 && moveSection <= moveMax) {
                let percent = ((startLeft + (e.pageX - startX)) / moveMax).toFixed(4) * 100;
                percent.toString().length > 5 ? percent = percent.toString().subStr(0, 5) : percent = percent.toString();
                moveBlock.style.left = startLeft + (e.pageX - startX) + 'px';
                proBar.style.width = moveBlock.style.left;
                moveBlock.querySelector('p').innerText = percent + '%';
            }
        };
    };
    // 鼠标松开移除事件
    moveBlock.onmouseup = function(){
        document.onmousemove = null;
    };
})();
</script>
</html>