SOURCE

// 匿名类
let Rectangle = class {
    constructor(height, width) {
        this.height = height;
        this.width - width;
    }
}
console.log(Rectangle.name)

// 具名类
let Rectanglee = class Rectangle2 {
    constructor(height, width) {
        this.width = width;
        this.height = height;
    }
}
console.log(Rectanglee.name)