Stage 1: Basics

● Master Basic Syntax

○ Data Types: Familiarize yourself with the basic data types in JavaScript, including numbers (Number), strings (String), booleans (Boolean), null (Null), undefined (Undefined), and symbols (Symbol), as well as the reference data type object (Object). Understand their characteristics and usage.

○ Variables and Constants: Learn to declare variables and constants using var, let, and const, and understand the differences in their scopes.

○ Operators: Master various operators, such as arithmetic operators, comparison operators, logical operators, and assignment operators, and be able to use them to calculate expressions.

○ Statements: Be familiar with conditional statements (if...else, switch), loop statements (for, while, do...while), and jump statements (break, continue, return), and be able to control the program execution flow according to different requirements.

● Functions

○ Master the definition and calling methods of functions, including function declarations, function expressions, and arrow functions.

○ Understand function parameter passing and return values, and learn to use functions to encapsulate reusable code logic.

○ Understand the concepts of function scope and closures. Closures are an important and relatively difficult - to - understand feature in JavaScript, which allow functions to access the scope of their outer functions.

● Objects and Arrays

○ Objects: Learn to create and manipulate objects, including accessing object properties, assigning property values, and defining methods. Understand the inheritance and prototype chain mechanism of objects, which is a way for JavaScript to implement object - oriented programming.

○ Arrays: Master the creation of arrays, element access, element modification, and the use of array methods (e.g., push, pop, shift, unshift, splice, slice), and be able to use arrays to store and process a set of data.