JavaScript built-in objects (i)

I. What is an object

1. What is an object: All things in JavaScript are objects: strings, numbers, arrays, functions ...

Each object has properties and methods

JavaScript allows custom objects

2. Custom objects:

Defining and creating an object instance

Use a function to define an object, and then create a new object instance

<! DOCTYPE html>

Two, string Strings object
 1. String Object
String object to handle an existing string
strings can use single or double quotation marks
2. Find string in string: IndexOf ()
3. Content matching: Match ()
4. Replacement content: replace ()
5. String Case conversion: toUpperCase ()/tolowercase ()
6. String to array: Strong>split ()
7. String properties and methods:
Properties: Length, prototype, constructor
Methods: CharAt (), charCodeAt (),
<! DOCTYPE html>






JavaScript built-in objects (i)