The relationship between JavaScript prototypes and scope (2) Functions and objects

As mentioned above (understanding the JavaScript prototype and scope series (1)-Everything is an object), a function is a kind of object 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 a kind of object, because an array is like a subset of objects. But the function and the object, but not just a kind of inclusion and inclusion of the relationship between the function and the object of the relationship between the complex, and even a bit of chicken eggs raw chicken logic, we this section is a wisp of wisp.

Let's look at a small example first.

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

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

But I would say--objects are created by functions--some may refute: no! Because:

var obj = {a:10, b:20};

var arr = [5, ' X ', true];

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

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Words return to the story--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)); function

Console.log (typeof (Array)); function

So, you can say in person--objects are created by functions.

Now it's not confusing--objects are created by functions, and functions are objects--oh, God! What is the relationship between a function and an object?

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

This series of articles is not intended to be a thousands of-word long speech, we small steps to run, not to see too boring.

Author: cnblogs Wang Fu