<html><body><h3>如何访问输入按钮的演示</h3><p>单击按钮以获取显示在按钮上的文本。</p><input type="button" id="myBtn" onclick="myFunction()" value="Try it"><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myBtn").value; document.getElementById("demo").innerHTML = x;}</script></body></html>