​x
 
<!DOCTYPE html>
<html>
<body>
​
<input type="range" id="myRange" autofocus>
​
<p>单击该按钮可查看滑块控件是否在页面加载时自动获得焦点。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p><b>注意：</b>IE 9 及更早版本不支持带有 type="range" 的输入元素。</p>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myRange").autofocus;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​