<html>
<body>
Points: <input type="range" id="myRange" value="20">
<p>点击按钮显示滑块控件的值 </p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myRange").value;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>