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<!DOCTYPE html> <html> <body> <p>此示例使用 addEventListener() 方法将“error”事件附加到 img 元素。</p> <img id="myImg" src="image.gif"> <p id="demo"></p> <script> document.getElementById("myImg").addEventListener("error", myFunction); function myFunction() { document.getElementById("demo").innerHTML = "无法加载图像。"; } </script> </body> </html>