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<!DOCTYPE html> <html> <head> <script> function myFunction() { document.getElementById("demo").innerHTML = "Hello World!"; } </script> </head> <body> <p>当您点击“试一试”时，一个函数将被调用。</p> <p>该函数将显示一条消息。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> </body> </html>