>[success] # 混入 * 对象混入 ~~~ // TS 对象的混入 interface A { name:string } interface B { age:number } const a:A = {name:'wang'} const b:B = {age:17} const c = Object.assign(a,b) // const c:A&B ~~~ * 类混入 [类混入](https://typescript.bootcss.com/mixins.html)