There are several types of comments in javascript

There are three types of JavaScript comments, namely: 1. Multi-line comments, starting with "/*" and ending with "*/", with the syntax "/* comment content*/"; 2. Single-line comments Comments start with double slashes "//", and the syntax is "//comment content"; 3. Line comments, the syntax is "

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

There are three comment methods in JavaScript (js) language

The first oneis a multi-line comment"/**/", generally at the beginning of a js file, introduce the author, functions and other information.

 /*
  在 id 属性为 demo 的标签中
  添加指定内容
 */
document.getElementById("demo").innerHTML = "https://www.php.cn/";

The second comment method is the most common "//", which can be seen everywhere in the program and can only comment a single line.

//这是一行注释，只能注释单行。
//另一行注释

The third comment is not very common and will be confused with the comments in html, so it is not recommended.

<!-这是一行注释，只能注释单行。

The third method is not to add --> after it. This is different from html comments.

[Recommended learning: javascript advanced tutorial]

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