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可选参数 ?: 的用法 function buildName(firstName: string, lastName?: string) { if (lastName) return firstName + " " + lastName; else return firstName; } let r 阅读全文
posted @ 2020-04-17 14:23
He_LiangLiang
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构造函数 class Greeter { greeting: string; constructor(message: string) { this.greeting = message; } greet() { return "Hello, " + this.greeting; } } let g 阅读全文
posted @ 2020-04-17 13:48
He_LiangLiang
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class Greeter { name:string="abc"; greeting: string; constructor(message: string) { this.greeting = message; } greet() { return "Hello, " + this.greet 阅读全文
posted @ 2020-04-17 13:43
He_LiangLiang
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typescript接口 interface Shape { color: string; } interface PenStroke { penWidth: number; } interface Square extends Shape, PenStroke { sideLength: numb 阅读全文
posted @ 2020-04-17 13:35
He_LiangLiang
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