What does double diagonal bar mean in JavaScript?

In JavaScript, the double slash "//" represents a single-line comment. All characters in the line after the "//" character will be regarded as single-line comment information. The syntax format is "//single-line comment information" . When using single-line comments, any characters or codes in the same line after "//" will be ignored and will not be parsed.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In JavaScript, the double slash "//" represents a single-line comment.

#Comments in JavaScript (single-line comments and multi-line comments)

Comments are a string of characters that are not parsed. JavaScript comments have the following two methods:

• Single-line comments: //Single-line comment information.

• Multi-line comments: /*Multi-line comment information*/.

Example 1

Treats all characters in one line after the // characters as single-line comment information. The following comment statements can be located at different locations in the code segment to describe the functions of different areas of code.

//程序描述
function toStr(a){  //块描述
  //代码段描述
  return a.toString();  //语句描述
}

When using a single-line comment, any characters or codes in the same line following <span style="color: rgb(192, 80, 77);">//</span> will be ignored and will not Analyze again.

Example 2

Use /* and */ to define multi-line comment information.

/*
* jQuery JavaScript Library v3.3.1
* https://jquery.com/
* Includes Sizzle.js
* https://sizzlejs.com/
* Copyright JS Foundation and other contributors
* Released under the MIT license
* https://jquery.org/license
* Date: 2019-08-21 T 17:24 Z
*/

in a multi-line comment, contained between <span style="color: rgb(192, 80, 77);">/*</span> and <span style="color: rgb(192, 80, 77);">*/ Any characters between the </span> symbols are treated as comment text and ignored.

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