JavaScript Advanced Programming--Learn from scratch (3)

Object Basics

1. OOP

2. Object Application

3. Type of Object

3.1 Local objects

ECMA-262T defines local objects (native object) as "objects provided by ECMAScript implementations that are independent of the hosting environment." In simple terms, a local object is a class ( reference type ) defined by ECMA-262.

They include:

　　　　Object Function Array String Boolean

Number Date RegExp Error evalerror

Rangeerror referenceerror syntaxerror TypeError urierror

3.2 Built-in objects

ECMA-262 defines the built-in object (built-in object) as "all objects that are provided by the ECMAScript implementation, independent of the hosting environment , and appear when the ECMAScript program starts executing."

ECMA-262 only defines two built-in objects:Global and Math. built-in objects are also local objects .

In ECMAScript, there is no independent function, and all functions must be methods of an object.

encodeURI (): Does not encode special characters in URIs, such as colons, front slashes, question marks, and pound signs.

encodeURIComponent (): Encodes all non-standard characters it discovers. These two methods are used to encode the URI passed to the browser.

decodeURI ():

decodeURIComponent ():

　　　　　　Eval (): The most powerful way to accept a parameter, which is the ECMAScript (or JavaScript) string to execute.

3.3 Host Objects

4. Scope

4.1 Public, protected, and private scopes

4.2 Static scopes are not static

4.3 keyword this

5. Defining classes or objects

6. Modify the Object

JavaScript Advanced Programming--Learn from scratch (3)