Two options for js singleton mode_javascript skills

//Option 1
var SingletonTester = (function { Another way is to return the object
this.pointX = args.pointX || 6;
this.pointY = args.pointY || 10;
}

//Single instance
var instance;

//return object
return {
name: 'SingletonTester',

getInstance: function (args) {
                 if (instance = == undefined) {
                       instance = new Singleton(args);                                                                          
})(); //Execute this method directly

//Test
var test = SingletonTester.getInstance({ pointX: 5 });
console.log(test.pointX);




Option 2:

// Other content
this.start_time = 0;
this.bang = "Big";

// Cache
Universe.instance = this;

// Implicitly return this
}

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