how do i expose function from anonymous self invoking function?

 (function(){
   var a = function () {
     alert("hey now!! ");
   };
   return {"hi":function(){return a;}};
 })();

开发者_开发百科 hi();

This code doesn' t work. How do i expose a function??

The self invoking function returns an object with the property hi, this object is not added to the global scope so that you can use the property directly. Put the result of the function in a variable:

var o =
(function(){

  var a = function (){
    alert("hey now!! ");
  };

  return {"hi":function(){return a;}};

})();

Using the property to call the function will only return the function contained in the variable a, so you have to call the return value from the function to call the function that contains the alert:

o.hi()();

Demo: http://jsfiddle.net/Guffa/9twaH/

There are two basic ways:

var MyNameSpace = (function(){

     function a (){
       alert("hey now!! ");
     };

     return {a: a};

})();

MyNameSpace.a();

or

(function(){

     function a (){
       alert("hey now!! ");
     };

     MyNameSpace = {a: a};

})();

MyNameSpace.a();

I prefer the 2nd way since it seems cleaner

It is called the "revealing module pattern" btw, which you can read up on to understand it better :)

https://addyosmani.com/resources/essentialjsdesignpatterns/book/#revealingmodulepatternjavascript

 var obj = (function(){

 var a=  function (){
    alert("hey now!! ");
 };

 return {"hi":function(){return a;}};

 })();

 obj.hi()

You have to assign the return value of the anonymous function to a variable in the current scope:

var f = (function() {
    var a = function() {
        alert("hey now!! ");
    };
    return {
        "hi": function() { return a; }
    };
})();
f.hi()();

It?

(function(){
   var a = function () {
     alert("hey now!! ");
   };
   return {"hi":function(){return a;}};
 })().hi()();

I suppose in order to expose the function, instead of its code, the syntax should be

var obj2 = (function(){

     var a=  function (){
        alert("hey now!! ");
     };

 return {"hi":a};

 })();

alert(obj2.hi());

Or you could wrap your 'hi' function in an IIFE like so...

var myFunction = (function(){
   var a = function () {
     alert("hey now!! ");
   };
   return {
       "hi": (function(){
           return a;
       }())
   };

 })();

 myFunction.hi();