<!DOCTYPE html>
<html>
<body>
<h3>演示如何访问 PROGRESS 元素</h3>
下载进度：
<progress id="myProgress" value="75" max="100">
</progress>
<p>点击按钮来获得下载进度条的当前进度值。</p>
<p id="demo"></p>
<button onclick="myFunction()">试一下</button>
<script>
function myFunction()
{
var x = document.getElementById("myProgress").value;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>