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用 typescript 写的例子,interface 定义类型会报错,type 不会

typescript 3.9.5

interface A {
  [name: string]: string
}

interface B {
  b: string
}

const b: B = { b: 'b' }

const a: A = b // 不能将类型“B”分配给类型“A”。类型“B”中缺少索引签名。ts(2322)

如代码所示,ts 检查报错了。将 interface B 改成 type B 就不报错了,两者用法有什么区别?


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