What is the order of execution of code in Javascript? -

how code in javascript executed? mean in order? there difference in order of execution if declared function this:

function render() {     // code here } 

instead of this:

var render = new function(){     // same code here }     

does javascript execute functions defined in scripting file regardless of whether they're called event handler? (e.g. onload=function()).

and if function defined in function, when parent function called, lower function called too? e.g.

function a(){      function b(){         // code     }      function c(){         //code     }  } 

i'm trying concrete understanding of order of execution in javascript.

var render = new function(){   // same code here } 

the new keyword doesn't create new function. creates new object running function. run body of method , return object instead.

if asking when functions parsed , added scope that's implementation specific, functions hoisted top of scope , parsed before code executed.

functions only executed when call them invoking f()