回调事件index错乱

[lianyi007]

当启用uploadAsync时，多文件上传很多事件回调如on('fileuploaded', function (event, data, previewId, index, fid) {}) 中的index经常都是错乱的，经排查调试发现是

变量i污染导致，改成下面这样就解决问题

[wpcoc]

Yeah, assuming the call to self._uploadSingle is causing changes to i, it looks like you're right.

[stale]

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