Uploadify checkExisting

用于检查上传的文件名是否在目标文件夹内已经存在

<input type="file" name="file_upload" id="file_upload" />

$(function() {
    $("#file_upload").uploadify({
        'checkExisting' : '/uploadify/check-exists.php',
        'swf'           : '/uploadify/uploadify.swf',
        'uploader'      : '/uploadify/uploadify.php'
    });
});