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<!DOCTYPE html> <html> <body> <p>点击按钮演示提示框。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var person = prompt("Please enter your name", "Harry Potter"); if (person != null) { document.getElementById("demo").innerHTML = "Hello " + person + "! How are you today?"; } } </script> </body> </html>