JavaScript comments can be used to improve the readability of your code.

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JavaScript Comments

JavaScript will not execute comments.

We can add comments to explain JavaScript or improve the readability of the code.

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Single-line comments begin with //.

This example uses a single line comment to explain the code:

     
  
 
  
注释：注释不会被执行。
  

Run the program and try it

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JavaScript multi-line comments

Multi-line comments start with /* and end with */.

The following example uses multi-line comments to explain the code:

     
  
 
  
注释：注释块不会被执行。
  

Run the program to try it

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Use comments to block execution

In the following example, the comment is used to prevent the execution of one of the lines of code (can be used for debugging):

     
  
 
  
注意: 注释块不会被执行
  

Run the program to try it

Note : Multi-line comments are used the same as above. Just wrap the code blocks that do not need to be executed with multi-line comments.

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Use comments at the end of the line

Like this

var x=5; // Declare x and assign 5 to it