About Function

  Function defines:

(1)  

    var test = function(){

     var s = 'hello';

     for(var i in s){

      consule.log(s[i]);

}

};

 

 (2)

(function($){

        /*

 

          */

 

})(jQuery);//execute immediately

(3)

function test(){

   var secret = 0;

   setValue = function(i){

     secret = i;

};

  getValue = function(){

    return secret;

};

}//protecte the message.

(4)

Iterator:

 

 function test(x){

   var i = 0;

   return function(){

    return x[i++];

}

}

 var str = test([1,2,4]);

str();//input 1

str();//input 2

....