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How to use php to determine file extension

一个新手Original: 2017-09-12 10:14:151791browse

<!DOCTYPE>
<html>
<head>
    <meta http-equiv="Content-type" content="text/html" charset="utf-8">
    <title>check file</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>    function check(obj){        
    if(obj.value == "" || obj.value.length<3){
            alert("输入的长度不能小于3且不能为空!");
            obj.focus();
        }
    }    function check_value(){        var str = $("int").value;        var repx = /\.(php|asp|jsp)$/i;        var type = str.substring(str.lastIndexOf("."),str.length);        if(type.match(repx) && str.lastIndexOf(".") != -1){
            alert("文件扩展名正确");
            $("int").focus();
        }else{
            alert("文件扩展名有误");
            $("int").focus();
        }
    }    function $(obj){        return document.getElementById(obj);
    }</script>
</body>
</html>

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