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@@ -0,0 +1,76 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ .progress{
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+ width: 500px;
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+ height: 50px;
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+ border:3px solid black;
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+ border-radius: 10px;
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+ line-height: 50px;
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+ padding-left: 50px;
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+ box-sizing: border-box;
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+ position: relative;
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+ overflow: hidden;
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+ }
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+ .progress-bg{
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+ width: 0;
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+ height: 100%;
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+ background-color: blue;
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+ position: absolute;
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+ top: 0;
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+ left: 0;
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+ }
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+ .progress-num{
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+ position: relative;
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+ z-index: 1;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="progress">
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+ <span class="progress-num">0%</span>
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+ <div class="progress-bg"></div>
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+ </div>
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+ <button>开始</button>
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+ <script>
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+ // 第一步获取元素
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+ // 获取按钮
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+ var progressBtn = document.getElementsByTagName("button");
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+ progressBtn = progressBtn[0];
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+ // 获取进度条
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+ var progressBg = document.getElementsByClassName("progress-bg");
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+ progressBg = progressBg[0];
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+ // 获取进度条文字
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+ var progressNum = document.getElementsByClassName("progress-num");
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+ progressNum = progressNum[0];
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+ //用来存储定时器
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+ var timer = null;
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+ // 定义变量存储进度数字
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+ var num = 0;
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+
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+ // 第二步为按钮绑定事件
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+ progressBtn.onclick = function(){
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+ // 通过offsetWidth 获取元素宽度
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+ var thisWidth = progressBg.offsetWidth;
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+ // 设置一个定时函数实现动画过度效果
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+ timer = setInterval(function(){
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+ thisWidth += 5;
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+ num++
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+ if(thisWidth <= 500){
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+ progressBg.style.width = thisWidth + "px";
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+ progressNum.innerText = num + "%";
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+ }else{
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+ clearInterval(timer);
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+ }
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+
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+
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+ // progressBg.style.width = (thisWidth + 10) + "px";
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+ },16);
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+ }
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+ </script>
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+</body>
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+</html>
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