1.https://www.w3cschool.cn/typescript/typescript-df-publishing.html
2.https://www.dengwb.com/typescript/
3.https://juejin.im/post/5e38dd65518825492b509dd6
4.https://ts.xcatliu.com/
5.https://www.tslang.cn/docs/handbook/basic-types.html
6.https://ts.xcatliu.com/basics/type-assertion.html
7.https://www.typescriptlang.org/docs/handbook/declaration-merging.html#merging-namespaces
