前端23种js设计模式中参见的7种设计模式的学习

class Product {
    constructor(options) {
        this.name = options.name;
        this.time = options.time;
        this.init();
    }
    init() {
        console.log(`产品名：${this.name} 保质期：${this.time}`);
    }
}
class Factory {
    create(options) {
        return new Product(options);
    }
}

let factory = new Factory();
let product1 = factory.create({ name: "面包", time: "1个月" });

function SingleObject() {
    this.name = "单例";
}

SingleObject.getInstance = function() {
    if (!this.instance) {
        this.instance = new SingleObject();
    } 
    return this.instance;
};

var obj1 = SingleObject.getInstance();
var obj2 = SingleObject.getInstance();

console.log(obj1 === obj2);