<html> <body> <img id="image" src="/static/demo/images/eg_smile.gif" /> <script type="text/javascript"> document.getElementById('image').src="/static/demo/images/eg_landscape.jpg" </script> <p><b>注释:</b>原始图片是一个笑脸,但是上面的脚本把图片改为风景。</p> </body> </html>