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第二部分 设计模式

4.1 实现单例模式

var Singleton = function(name){
            this.name = name
            this.instance = null
        }

        Singleton.prototype.getName = function(){
            alert(this.name)
        }

        Singleton.getInstance = function(name){
            if(!this.instance){
                this.instance = new Singleton(name)
            }
            return this.instance
        }

        var a = Singleton.getInstance('sven1')
        var b = Singleton.getInstance('sven2')

        console.log(a===b);