概念

• 用于把抽象化与实现化解耦
• 使得二者可以独立变化

演示

class ColorShape {
    yellowCircle() {
        console.log('yellow circle')
    }
    redCircle() {
        console.log('red circle')
    }
    yellowTriangle() {
        console.log('yellow triangle')
    }
    redTriangle() {
        console.log('red triangle')
    }
}

// 测试
let cs = new ColorShape()
cs.yellowCircle()
cs.redCircle()
cs.yellowTriangle()
cs.redTriangle()

下面是桥接模式代码：

class Color {
    constructor(name) {
        this.name = name
    }
}

class Shape {
    constructor(name, color) {
        this.name = name
        this.color = color
    }
    draw() {
        console.log(`${this.color.name} ${this.name}`)
    }
}

// 测试
let red = new Color('red')
let yellow = new Color('yellow')

let circle = new Shape('circle', red)
circle.draw()
let triangle = new Shape('triangle', yellow)
triangle.draw()

设计原则验证

• 抽象和实现分离，解耦
• 符合开放封闭原则