fixed downloader.onProgress call error #1919
Merged
+2
−2
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RE: cocos/2d-tasks#2028 .

根据调试了代码调用上下文,len 的功能应该是 :the number of bytes to write. 也就是要写入的字节数。
而 len 是 onProgress 需要接受的参数 downloadBytes。


len 也是 nativeOnProgress 需要的 dl
在 native 上测试正常。