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Update newConstructure.md #83

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Expand Up @@ -17,6 +17,7 @@ React16架构可以分为三层：
其实部分浏览器已经实现了这个API，这就是[requestIdleCallback](https://developer.mozilla.org/zh-CN/docs/Web/API/Window/requestIdleCallback)。但是由于以下因素，`React`放弃使用：

- 浏览器兼容性
- `requestIdleCallback`的FPS只有20，远远低于页面流畅度的要求（一般FPS为60）
- 触发频率不稳定，受很多因素影响。比如当我们的浏览器切换tab后，之前tab注册的`requestIdleCallback`触发的频率会变得很低

基于以上原因，`React`实现了功能更完备的`requestIdleCallback`polyfill，这就是**Scheduler**。除了在空闲时触发回调的功能外，**Scheduler**还提供了多种调度优先级供任务设置。
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