​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>演示如何访问输入按钮</h1>
​
<p>单击按钮可获取显示在按钮上的文本。</p>
​
<input type="button" id="myBtn" onclick="myFunction()" value="试一试">
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myBtn").value;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​