A detailed description of the call function

Because recently to the end of the final, but also to prepare six levels, to prepare a little more examinations, in fact, is to make lazy.

Today still a little remorse, or to learn, write something, not to say nonsense, directly write.

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Today in the front-end group saw a

Dmitry Baranovskiy's Blog contains an article (link) with five small pieces of code to test the understanding of JavaScript's core, closures, and scopes.

Then there were some problems, but most of them were solved.

The last one, the call function, let me react for a while, and then I thought I hadn't seen it. ）

I went to Baidu, see the official explanation:

The all method invokes one method of an object, replacing the current object with another object. Call ([thisobj[,arg1[, arg2[,   [,. ArgN]]]) parameter thisobj Optional. The object that will be used as the current object. Arg1, Arg2,  , argn options available. The method parameter sequence will be passed. Indicates that the call method can be used to invoke a method in place of another object. The call method can change the object context of a function from the initial context to a new object specified by Thisobj. If the Thisobj parameter is not provided, then the Global object is used as the thisobj.

I'm bluffing, what the heck, suddenly I think this is not inheritance.

function A (name) {this. name=name; this. show=function() {            alert ("I am" +this. name);                }    }        function B (name) {this. Name=name;a.call (thisvar  New B (' B '); B1.show ();

Popup result "I am B"

There is no Show method in B.

Direct is the inheritance we say.

Read a lot of the blog is said to be replaced, said a bit around can not really understand, I think according to my inheritance understanding is still very correct.

There are multiple inheritance, I do not know whether my understanding is a bit biased.

functionClass1 () { This. Name =function() {alert ("Class1 Method name ()"); }}  functionClass2 () {Class1.call ( This);//to implement Class2 inheritance Class1 This is the current object Class2. }  varCL =NewClass2 (); Cl.name ();//Class2 inherits the Class1,class2 is the parent class. Calling a method of the parent class  //another way to implement inheritance is to use an inheritance function specifically to implement inheritance.  functionExtend () {Class2.call ( This); Class1.call ( This);}

and apply is out of the scope of this article.

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See you next time, ECMAScript.

And his way of inheriting.

A detailed description of the call function