How to write javascript comment statements


This article mainly introduces the related knowledge about how to write javascript comment statements. The content is detailed and easy to understand, and the operation is simple and fast, which has certain reference value. I believe that everyone will gain something after reading this javascript comment statement. Let's take a look at it together.

I. Single-line Notes

A single-line comment is a comment statement indicated by a double slash//. A single-line comment can be used anywhere in the code, and only the text after the comment symbol will be commented. For example:

//This is a single-line comment.

var a = 1; //This is a code with comments.

Single-line comments are mainly used to comment a single line of code. They can be used to explain the meaning of code, provide a description of code, mark code blocks and so on. When debugging, single-line comments can be used to temporarily disable some code in order to check whether there is a problem with the code.

Second, multi-line comments

Multi-line comments enclose the comment text with/(comment start) and/(comment end). Multiline comments can span multiple lines of code and cannot be nested. For example:

/* This is a multiline comment that can span multiple lines of code */

var b = 2; /This is a code with comments/

Multi-line comments are mainly used to comment on large blocks of code or sample code in text documents. For example, when writing JavaScript code, multi-line comments can be used to provide detailed information such as parameter list, examples and return values of a function or method. In large projects, multi-line comments can be used to organize and comment code blocks, making them easy to understand and modify.

Third, the document notes

Document annotation, also known as JSDoc annotation, is an annotated document format based on multi-line annotation. JSDoc comments are used to generate API documents, so that developers can quickly understand the usage, parameters and return values of JavaScript code. The syntax of JSDoc comments is similar to that of multiline comments, but it needs to follow a specific format and specification. For example:


This is an example of document annotation.

@param {number} x-Description of the first parameter.

@param {number} y-Description of the second parameter.

@return {number} Description of calculation result */

function add(x, y) {  return x + y; }

Document comments are mainly used to generate API documents. In team development, document annotation can make the code easier to read, maintain and update, and also further improve the readability and maintainability of the code. Document annotations can also be used to generate other document formats, such as Markdown, HTML, PDF and ePub.

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