[（1）HTTP的请求](%EF%BC%881%EF%BC%89HTTP%E7%9A%84%E8%AF%B7%E6%B1%82.md) [（2）funtion的封装](%EF%BC%882%EF%BC%89funtion%E7%9A%84%E5%B0%81%E8%A3%85.md) [（3）class封装http](%EF%BC%883%EF%BC%89class%E5%B0%81%E8%A3%85http.md) [（4）promise封装](%EF%BC%884%EF%BC%89primise%E5%B0%81%E8%A3%85.md)