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32 lines
570 B
32 lines
570 B
// 使用接口来描述对象的类型，达到复用的目的
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// 接口：只能为对象指定类型
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interface IPerson {
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name: string
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age: number
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sayHi(): void
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}
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// 对象使用接口
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let Iperson: IPerson = {
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name: 'Ken',
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age: 20,
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sayHi() {}
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}
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// type（类型别名）：可以为对象指定类型，还可以任意类型指定别名
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type IPerson2 = {
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name: string
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age: number
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sayHi(): void
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}
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let Iperson2: IPerson2 ={
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name: 'Ken',
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age: 20,
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sayHi() {}
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}
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// 任意类型指定别名
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type NumStr = number | string
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