VincentHuang

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偶尔就会出现这个问题,然后后续每次滑动都是NaN...完全无解

![wx20190125-143934](https://user-images.githubusercontent.com/13195247/51729517-0e223800-20af-11e9-903b-afa4493a9d12.png) ![wx20190125-143857](https://user-images.githubusercontent.com/13195247/51729525-14181900-20af-11e9-8adc-1f750ba48441.png) 试着打印了一下,dt居然有为0的时候,自然基于dt计算得出的speed为NaN了...