Since the implementation of the difference between the function name and function

 

Naming function and normal function needs to be anonymous call; self-executing function once defined, can be performed immediately.

<Script> 
　　　　 // printing variables before assigning undefined; the other assignment, outputs; 　　　　 the console.log (A); // undefined var A = 10 ;  

        
        console.log(a);//10

        var a=function(){
            console.log ( "OK"); // before the call is not not print OK 
        }
        a();//OK

        console.log(function(a){
            return a;
        } ( "Definition Executive" ));
         // define implementation 
    </ script>

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