How to quickly comment in javascript

JavaScript is a programming language widely used in web development and web application development. As web applications continue to develop and spread, the importance of the JavaScript language continues to increase. Comments play a vital role in the process of writing JavaScript code. Comments can improve the readability and maintainability of code, making it easier for developers to understand the role and purpose of the code. This article will introduce several JavaScript shortcut annotation methods to help developers add annotations faster and more accurately.

1. Single-line comments

A single-line comment starts with two slashes "//", and you can add comments at the end of the line of code. For example:

var num = 10; // 定义一个变量num并初始化为10

In the above code, the comment and assignment statement are on the same line to explain the role and initialization value of the variable num. Single-line comments are useful for commenting a brief description or explaining what a line of code does.

2. Block comments

Block comments start with "/" and end with "/". They can be used to comment multiple lines of code or long sections of code. For example:

/*
  定义一个函数，参数a、b分别为数字类型，返回a与b的和
*/
function add(a, b) {
  return a + b;
}

Block comments can be used to annotate function definitions, conditional statements, loop structures, etc. to make the code clearer and easier to understand.

3. Documentation comments

Documentation comments are also a type of block comments, but they have a specific format and can be used to generate API documentation. Documentation comments start with "/*" and end with "/". The format is as follows:

/**
 * @description 描述函数的作用、参数和返回值
 * @param {类型} 参数名 参数描述
 * @param {类型} ...
 * @returns {类型} 返回值描述
 */

For example:

/**
 * @description 定义一个函数，将字符串转为数字
 * @param {string} str 要转换的字符串
 * @returns {number} 转换后的数字
 */
function str2num(str) {
  return Number(str);
}

The description in the documentation comment should be as detailed and detailed as possible. Be accurate. Parameters and return values ​​should indicate their types and meanings so that other developers can use them or generate API documents.

4. TODO comments

In the process of writing code, we may encounter some tasks that require follow-up work to complete, such as unfinished code, bugs that need to be fixed, and additions that need to be added. functions, etc. In order to better record these tasks that need to be completed, we can use TODO comments. TODO comments start with "TODO", followed by a task description, for example:

// TODO: 完成用户登录界面
// TODO: 修改保存用户信息的接口
// TODO: 添加验证用户权限的函数

TODO comments can help developers better manage their work and improve the maintainability of the code.

In short, comments are an integral part of writing JavaScript code. Quick comments allow us to add comments faster and more accurately, improving the readability and maintainability of the code. At the same time, we should also pay attention to the quality and accuracy of comments, so that comments can really help us understand and modify the code.

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