W3School TIY
编辑您的代码：
<html> <head> <script type="text/javascript"> function change_header() { document.getElementById("myHeader").innerHTML="Nice day!"; } </script> </head> <body> <h1 id="myHeader">Hello World!</h1> <button onclick="change_header()">Change text</button> </body> </html>
查看结果: