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14 lines
404 B
14 lines
404 B
// 接口 Point2D 和 Point3D 都具有 x、y 属性，重复两次，繁琐
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/* interface Point2D { x: number; y: number }
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interface Point3D { x: number; y: number; z: number } */
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// 使用接口继承，实现复用
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interface Point2D { x: number; y: number}
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// Point3D 具有 Point2D 的 x、y 属性
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interface Point3D extends Point2D { z: number}
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let p3: Point3D = {
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x: 20,
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y: 30,
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z: 40
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}
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