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<!DOCTYPE html> <html> <body> <p>此示例使用 addEventListener() 方法将“focus”事件附加到输入元素。</p> 输入你的名字： <input type="text" id="fname"> <script> document.getElementById("fname").addEventListener("focus", myFunction); function myFunction() { document.getElementById("fname").style.backgroundColor = "red"; } </script> </body> </html>