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What is the object?

The type of object is Object.

Everything in JavaScript is an object: strings, numeric values, arrays, functions.

Everything is an object in javaScript

Explain the object in a more official language:

What is an object is actually a type, that is, a reference type. The value of the object is an instance of the reference type. In ECMAScript, a reference type is a data structure that organizes data and functions together. It is also often called a class, but there is no such thing in ECMAScript. Although ECMAScript is an object-oriented language, it does not have the basic structures such as classes supported by traditional object-oriented languages.

What if you want to have a date?

Create objects: (create two ways)

1.New, an object comes out.

Var obj = new Object ()

Found the object > the first thing that comes to mind is attributes.

Add an attribute to the object

Obj.bianmei=' wow is really getting prettier.

Expand:

Obj.fn=function () {

Code block

}

Obj.fn ()

The property of obj can be a function

The pointer this in the obj function points to the obj object

two。 Create objects literally:

Var obj= {}

Add an attribute to the object

Key-value pair

Obj= {

Jian:zhi

}

Take the value through the key; press the key of the keyboard, the corresponding value will appear; this is the same as the value principle of the object; take the value through the key

Of course, you can also put functions in such objects, and the functions run in the same way as before, and the this pointer in the object also points to the current object.

Delete the properties of an object

Delete obj.jian

You can write a little exercise yourself, create an object of your own by string concatenation, and define a method in the object to make it pop up.

1. One's own name

two。 One's age

3. One's own hobby

4. A small summary

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