Author: Zen and the Art of Computer Programming
1 Introduction
1.1 Purpose of writing
After reading this article, readers can understand the definition, declaration, and calling methods of functions in JavaScript, as well as some commonly used library functions. The article expands from the following aspects:
Function definition and calling method: including function definition syntax, parameter passing method, etc.;
Commonly used built-in functions: Math, Date, Array, etc.;
Third-party library functions: library functions covering multiple fields such as arrays, strings, and mathematical calculations;
Modular programming mode: provides a programming paradigm for modular programming;
Asynchronous programming model: introduces the asynchronous programming model with Promises and callback functions;
Practical experience: Starting from actual business needs, combined with examples and examples, technical points such as functions, asynchrony, and modularization are explained and verified in practice.
1.2 Summary of the article
This article analyzes knowledge points such as function definition, call, parameter passing, modular programming, asynchronous programming, and array processing in JavaScript. From defining grammar to usage and characteristics, to extended functions in special scenarios, these knowledge points are explained in an all-round and detailed manner. At the same time, this article will also give the source code analysis of some existing mature library functions. It is hoped that through this document, readers can understand the principles behind these functions, the implementation process, application scenarios, and common option configurations, so that they can be better in the development process. to solve the problem.
1.3 Introduction to the author
Chen Liang is currently an algorithm engineer of Tencent Video Company. He focuses on front-end development and has many years of experience. He is good at data structure and algorithm, computer network, Web development, JavaScript language and other related technologies. Welcome to communicate and learn with me!
2. Function definition and call
2.1 Definition of function
A function is a code fragment that can be reused. It has an independent context execution environment and can accept