补做3月20日作业
代码：
实例
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>中央空调100后台管理系统</title> </head> <body> <table border="0" cellspacing="1" cellpadding="5" align="center" width="960"> <tr height=60> <td colspan="2"> <iframe src="inc/top.html" name="top" height="70" width="100%" frameborder="0" align="center" scrolling="no"></iframe> </td> </tr> <tr><td width="100%" colspan="2"><hr size="4" color="red"></td></tr> <tr> <td > <iframe src="inc/left.html" name="left" height="600" width="140" frameborder="2" align="center" scrolling="no"></iframe> </td> <td> <iframe src="inc/default.html" name="right" height="600" width="800" frameborder="2" align="left" scrolling="no"></iframe> </td> </tr> <tr><td width="100%" colspan="2"><hr size="4" color="skyblue"></td></tr> <tr> <td colspan="2"> <iframe src="inc/footer.html" name="footer" height="70" width="100%" frameborder="0" align="center"></iframe> </td> </tr> </table> </body> </html>
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代码执行结果图片：
手写代码图片：
