js單例模式的兩種方案_javascript技巧

//方案一 () {
        //單例方法
        function Singleton(args) {
         this.name = 'SingletonTester'; //方法對外的屬性，另一方法是回傳對象
            this.pointX = args.pointX || 6;
         >
        //單例實例
        var instance;

        //返回物件
       
            getInstance: function (args) {
              == undefined) {
                    instance = new Singleton(args);             }
        };
  )(   🎜>
    //測試
    var test = SingletonTester.getInstance({ pointX: 5 });
    console.log(test.pointX);
    console.log(test.pointX);




方案二：　

      // 快取  }

  // 測試
  var uni = new Universe();
  var uni2 = new Universe();
  console.log(uni === uni2); // true