uploadify3.2.1问题
如何判断客户端是否选择了文件？
类似：2.1.4的 $('#uploadify').uploadifySettings('queueSize'); uploadify
[解决办法]
$('#uploadify').uploadify('settings', 'queueSize', val);
More details ref to http://uploadify-cn.info/documentation/uploadify/settings/index.html