本文实例讲述了javascript实现校验文件上传控件。分享给大家供大家参考。具体如下：
该javascript校验文件上传控件代码可检测上传文件的类型是否是图片
<script language="javascript"> function Checkfiles() { var fup = document.getElementById('logo1'); var fileName = fup.value; var ext = fileName.substring(fileName.lastIndexOf('.') + 1); if(ext == "gif" || ext == "GIF" || ext == "JPEG" || ext == "jpeg" || ext == "jpg" || ext == "JPG" || ext == "png" || ext == "PNG") { return true; } else{ alert("Upload JPG, JPEG, PNG, GIF images only"); fup.focus(); return false; } } </script> onchange="Checkfiles()"
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