1.Boorstrap进度条
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Bootstrap进度条</title>
<!--width=device-width 表示宽度是设备屏幕的宽度。
initial-scale=1 表示初始的缩放比例。
shrink-to-fit=no 自动适应手机屏幕的宽度。-->
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="../css/bootstrap.css">
<style type="text/css">
</style>
</head>
<body>
<div class="jumbotron text-center">
<h1>Bootstrap进度条</h1>
</div>
<div class="container">
<div class="progress">
<div class="progress-bar progress-bar-striped progress-bar-animated" id="s-progress" style="width: 0%">
</div>
</div>
</div>
<script type="text/javascript">
var num = 10;
const progressFlag = setInterval(function () {
num += 10;
let progressElement = document.getElementById("s-progress");
progressElement.innerText = num + '%';
progressElement.style.width = num + '%'
}, 3000);
setTimeout(function () {
window.clearInterval(progressFlag)
}, 27000)
</script>
</body>
</html>