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Most people do not understand the knowledge points of this article "how to quote the this keyword of JavaScript", so the editor summarizes the following content, detailed content, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "how to quote the this keyword of JavaScript" article.

JavaScript this keyword

In an object-oriented language, this represents a reference to the current object.

But in JavaScript, this is not fixed, it will change with the change of execution environment.

In a method, this represents the object to which the method belongs.

If used alone, this represents a global object.

In the function, this represents the global object.

In the function, this is undefined (undefined) in strict mode.

In an event, this represents the element that receives the event.

Methods like call () and apply () can reference this to any object.

Case study

Var person = {

FirstName: "John"

LastName: "Doe"

Id: 5566

FullName: function () {

Return this.firstName + "" + this.lastName

}

}

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