W3School TIY
编辑您的代码：
<html> <head> <script type="text/javascript"> function getValue() { var x=document.getElementById("myHeader") alert(x.innerHTML) } </script> </head> <body> <h1 id="myHeader" onclick="getValue()">这是标题</h1> <p>点击标题，会提示出它的值。</p> </body> </html>
查看结果: