Deep understanding of JavaScript prototypes and Closures (2)--relationships between functions and objects

Reproduced in http://www.cnblogs.com/wangfupeng1988/p/3978035.html. Thank you!

The above (understanding JavaScript prototypes and Scope series (1)-Everything is an object) has already been mentioned, and the function is one of the objects because it can be judged by the instanceof function.

var fn = function () {};console.log (fn instanceof Object);  True

Right! A function is an object, but a function is not like an array-you can say that an array is one of the objects because the array is like a subset of objects. But between the function and the object, but not just a contained and contained relationship, the relationship between functions and objects is more complex, and even a little chicken eggs to raw chicken logic, we have a wisp of this section.

Let's look at a small example.

        function Fn () {            this.name = ' Wang Fu ';            This.year = 1988;        }        var fn1 = new Fn ();

The above example is simple enough to illustrate that an object can be created by a function. Right! Can only illustrate this point.

But I would say-- objects are created through functions --Some may argue: No! Because:

var obj = {a:10, b:20};var arr = [5, ' X ', true];

But sorry, this--really--is a--"shortcut", in the programming language, is generally called "syntax sugar."

Do "Grammar sugar" do the best is Microsoft eldest brother, it put their home C # that kid did not male and female from, this want to figure personally see people love, who chengxiang also get place with people explain-actually it is a boy!

In fact, the essence of the above code is:

        var obj = {a:10, b:20};        var arr = [5, ' X ', true];        var obj = new Object ();        OBJ.A = ten;        OBJ.B =;        var arr = new Array ();        Arr[0] = 5;        ARR[1] = ' x ';        ARR[2] = true;

And the Object and Array are functions:

Console.log (typeof (Object));  Functionconsole.log (typeof (Array));  function

Therefore, it is very responsible to say that objects are created through functions.

Now is not confused--the object is created by the function, but the function is an object--God! What is the relationship between functions and objects?

Don't worry! To uncover this mystery, you'll have to get to know another old friend--prototype prototype.

This series of articles is not intended to be a lengthy thousands of words, we run small steps, not too boring to see.

Deep understanding of JavaScript prototypes and Closures (2)--relationships between functions and objects