JavaScript design Pattern---(Singleton mode learning)

Single-Case mode

A class can have only one instantiated object. such as the PopOver layer on the page, one page only needs one.

Implementation: Create a class that contains a method that creates a new instance object without the presence of an object. If the object exists, this object simply returns a reference to the object.

varSingleton = (functionSingleton () {varInstance =NULL;//Store a reference to a singleton instance
Create a single casefunctionInit () {
Private methods and propertiesfunctionPrivatemethod () {Console.log (' This is a private method! ')        }        varprivatevariable = ' I am a private variable! 'return {
Public methods and properties Publicmethod:function() {Console.log (' Public ')}, Getprivatevariable:function () {                returnPrivatevariable}} }    return{getinstance:function () {            if(!instance) {Instance=init (); }            returninstance; }    }})();

This method is not abstract enough, if we need to create a singleton function changes? So we further abstract functions

var function (FN) {    varnull;     return function () {        return Instance | | Fn.call (this, arguments)    }}

JavaScript design Pattern---(Singleton mode learning)