)
}
以上代码运行的时候报错：setState(...): Cannot update during an existing state transition (such as within `render` or another component's constructor). Render methods should be a pure function of props and state; constructor side-effects are an anti-pattern, but can be moved to `componentWillMount`
具体的意思我觉得应该是reader里面执行的this._onProgress方法里有一个setState不能够执行到。但我不知道怎么改，有哪位大神或老师帮忙看看吗？跪谢！！
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