Rumah > Artikel > pembangunan bahagian belakang > php文件扩展名判断,_PHP教程
<!DOCTYPE> <html> <head> <meta http-equiv="Content-type" content="text/html" charset="utf-8"> <title>check <span>file</span></title> </head> <body> <b>文件扩展名验证</b> <input type="text" name="int" value="文件.php" onblur="check(this)" id="int"> <input type="button" value="检测" onclick="check_value()"> <script> <span>function</span><span> check(obj){ </span><span>if</span>(obj.value == "" || obj.value.length<3<span>){ alert(</span>"输入的长度不能小于3且不能为空!"<span>); obj</span>.<span>focus(); } } </span><span>function</span><span> check_value(){ </span><span>var</span> str = $("int").<span>value; </span><span>var</span> repx = /\.(php|asp|jsp)$/<span>i; </span><span>var</span> type = str.substring(str.lastIndexOf("."),str.<span>length); </span><span>if</span>(type.match(repx) && str.lastIndexOf(".") != -1<span>){ alert(</span>"文件扩展名正确"<span>); $(</span>"int").<span>focus(); }</span><span>else</span><span>{ alert(</span>"文件扩展名有误"<span>); $(</span>"int").<span>focus(); } } </span><span>function</span><span> $(obj){ </span><span>return</span> document.<span>getElementById(obj); } </span></script> </body> </html>