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23 lines
405 B
23 lines
405 B
// 两个类的兼容性演示：
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class Point {
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x: number
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y: number
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}
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class Point2D {
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x: number
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y: number
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}
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const p: Point = new Point2D()
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class Point3D {
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x: number
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y: number
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z: number
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}
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// 对象成员多的可以赋值给对象成员少的，Point3D 的成员多过 Point，所以可以赋值。
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const p1: Point = new Point3D()
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// 对象成员少的不能给对象多的
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