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# type和interface的区别

## interface

1. interface 只能用于定义对象类型
2. interface 方式可以实现接口的 extends 和 implements
3. interface 可以实现接口合并声明

## type

 type 的声明方式除了对象之外还可以定义交叉、联合、原始类型等，类型声明的方式适用范围显然更加广泛。