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This article mainly explains "how to call functions as a method of JavaScript". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to call functions as a method of JavaScript".

In JavaScript, you can define a function as an object method.

The following example creates an object (myObject) with two properties (firstName and lastName) and a method (fullName):

Example

Var myObject = {

FirstName: "Bill"

LastName: "Gates"

FullName: function () {

Return this.firstName + "" + this.lastName

}

}

MyObject.fullName (); / / will return "Bill Gates"

The fullName method is a function. This function belongs to the object. MyObject is the owner of the function.

Something called this is the object that "owns" this piece of JavaScript code. In this case, the value of this is myObject.

Test it! Modify the fullName method to return the value of this:

Example

Var myObject = {

FirstName: "John"

LastName: "Doe"

FullName: function () {

Return this

}

}

MyObject.fullName (); / / will return [object Object] (owner object)

Calling a function with an object method causes the value of the this to become the object itself.

Call a function through a function constructor

If the function call is preceded by the new keyword, then this is a constructor call.

It looks like you create a new function, but because the JavaScript function is an object, you actually create a new object

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