TypeScript

interface ClockInterface {
    currentTime: Date;
}

class Clock implements ClockInterface {
    currentTime: Date;
    constructor(private h: number, private m: number) { this.currentTime = new Date();
    }
}

JavaScript

var Clock = /** @class */ (function () {
    function Clock(h, m) {
        this.h = h;
        this.m = m;
        this.currentTime = new Date();
    }
    return Clock;
}());

构造函数里定义的参数，会自动成为JavaScript函数的属性。

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