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TypeScript 之 More on Functions

一个必选参数，两个可选参数。函数能传入两个参数吧？ ![image](https://user-images.githubusercontent.com/40545044/159607523-1bd35217-cdbc-4ef2-be9e-ed4df553ee10.png)

TypeScript 之 Conditional Types

> 下面的函数体怎么写才能不报红？ ![avatar](https://camo.githubusercontent.com/db054f09776a48776ae16e8b2a913259ee56000e01b5dd33c088f87d3f8f93c0/687474703a2f2f74656d702d6d612d636c69656e742e68756f646f6e6768657a692e7669702f696d616765736974652f6d656469612f696d6167652f323032322f352f31372f774955306c7a70676d632e706e67) ![avatar](https://camo.githubusercontent.com/4bf86933deca6af8fc8d473eb217a68c4b24bf5ebb24ae558d7dfcf996d6513a/687474703a2f2f74656d702d6d612d636c69656e742e68756f646f6e6768657a692e7669702f696d616765736974652f6d656469612f696d6167652f323032322f352f31372f725044484e66727752502e706e67) 可能这么写 ``` function createLabel( idOrName: T ): NameOrId { if (typeof idOrName === 'number') { return { id: 1 } as NameOrId } else if(typeof idOrName...