进行npm install时出现警告信息

执行$ npm install时出现警告信息，如下：
什么意思？
操作系统：win10

npm WARN optional Skipping failed optional dependency /browser-sync/chokidar/fsevents:                            
npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.0.8                            
npm WARN optional Skipping failed optional dependency /chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: fsevents@1.0.8                            

---

fsevent是mac osx系统的，你是在win或者Linux下使用了 所以会有警告，忽略即可