a library which can intercept the loading process of webpage resource and cache all the resource files we are interested, just like css files,js files, images files ,html files and so on.So we can share the cache between the web view and our native logic.（这个库可以帮组我们拦截webview加载网页的时候所有的资源请求，并且根据实际的需求策略进行缓存管理。基于此，可以帮助我们实现webview与natvie的逻辑的缓存共存，比如webview与app共用图片加载库fresco的图片缓存）