为页面上所有链接规定默认目标：
- <head>
- <base target="_blank" />
- </head>
- <body>
- <a href="http://www.w3school.com.cn">W3School</a>
- </body>
按钮删除前提示，确认后执行操作
- <input name="button" type="button" onclick="javascript:if(confirm('确认删除？'))document.location.href='show.php?id=123'" value="删除" />
操作成功并转向
- echo "<script>alert('场次成功！');location.href='?".$back_url."';</script>";
- exit;
错误提示并后退
- echo "<script language=javascript>alert('不能为空！');javascript:history.back(-1);</script>";
- exit;