<!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);
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);
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 + '%';
}
};
};
moveBlock.onmouseup = function(){
document.onmousemove = null;
};
})();
</script>
</html>
