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<!DOCTYPE html> <html> <body> <h2>JavaScript addEventListener()</h2> <p>此示例使用 addEventListener() 方法在用户单击按钮时执行函数。</p> <button id="myBtn">试一试</button> <script> document.getElementById("myBtn").addEventListener("click", myFunction); function myFunction() { alert ("Hello World!"); } </script> </body> </html>