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<!DOCTYPE html> <html> <body> <h1>Hello World!</h1> <div id="myDiv" style="background-image:url('img_tree.png');border:1px solid black;height:400px;width:400px;">这是一个 DIV 元素。</div> <br> <button type="button" onclick="myFunction()">获取div的背景图片</button> <script> function myFunction() { alert(document.getElementById("myDiv").style.backgroundImage); } </script> </body> </html>