Javascript Comments
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Lets take look how to do javascript commenting but before that why its needed.

• Javascript comment is used in order to explain the code
• To prevent the execution when we do testing
• For debugging 

Their is two ways to do comment single and multi-line comment.

1)Single line comment

For single line comment we use // before any string 

// Declare x, give it the value of 5
var num = 5;  

//var numTwo = 5;    

// Write num to text:
document.getElementById("inputNum").innerHTML = num;

2)Multi-line comment

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

/*
This id demo text to explain how multi-line comment works
*/
document.getElementById("input1").innerHTML = "JavaScript multi-line Comments";