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js弹窗出错。高手帮改一下。解决思路

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Release： 2016-06-13 13:40:35
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js弹窗出错。高手帮改一下。急急急!!!!!!

PHP code
<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--><?php $qq=$_POST['qq'];
if(!$qq==""){
    if( strlen( $qq ) > 12 || strlen( $qq )  alert('对不起,你输入的QQ号码无效.请重新输入.');history.back();";
        exit();
    }
?>
Copy after login
QQ号码吉凶查询:



加粗部分出错。不会弹出提示。请高手帮看下，谢谢。/

if语句的前段好用。$qq ) > 12 || strlen( $qq ) 后段不好用。 !is_numeric( $qq ) || $qq
------解决方案--------------------
可以用正则 /^[1-9][\d]{4,11}$/ 匹配

is_numeric 对于 “00000001”，“1e10”等都是合法的
Related labels：
gt lt qq quot
source：php.cn
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