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<!DOCTYPE html> <html> <head> <style> #myDIV { width: 500px; height: 500px; background: coral url("smiley.gif") no-repeat fixed center; color: white } </style> </head> <body> <h1>使用 JavaScript 更改 background</h1> <p>点击“试一试”按钮来改变 DIV 元素的背景属性：</p> <button onclick="myFunction()">试一试</button> <div id="myDIV"> <p>我的 DIV 元素</p> </div> <script> function myFunction() { document.getElementById("myDIV").style.background = "url(smiley.gif) lightblue repeat-x center"; } </script> </body> </html>