本文實例講述了javascript實現校驗文件上傳控件。分享給大家供大家參考。具體如下：
該javascript校驗文件上傳控件代碼可檢測上傳文件的類型是否是圖片
<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()"希望本文所述對大家的javascript程序設計有所幫助。
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