Preparation before class

Introduction to programming tools

Introduction to javascript

js development history and learning summary

How to write a js code and run it

Declare variables and assign values

Variable naming rules

Data types—numeric and string

Other data types

Code comments

Convert other types to string

Numeric type conversion

boolean type conversion

Operator—arithmetic operator

unary operator

Logical Operators

comparison operator

Assignment operation

operator precedence

if judgment

Usage of switch-case

while loop

do-while loop

for loop

for loop prints triangles

for loop multiplication table

continue与break

Basic concepts of arrays

Get array elements

Iterate over array elements

Find the sum of array elements

Loop through array

Function declaration and calling

formal parameter

function return value

Anonymous functions and self-calling

function as parameter

Function as parameter 2

Variable promotion and code execution phase

Scope and code execution

Scope and scope chain

Overview of the object

Object declaration and use

this is an object

point to this

Object traversal and deletion

wrapper object

mathematical objects

date object

array object

string object

Code specifications