To write comments in Javascript, use the symbols // and /**/. Comments are useful to explain the workings of codes.
If you want to make a single-line comment, you have to put the symbol double slash(//) at the start of the line. A multi-line comment can be done by using the text inside the start symbol /* and the end symbol */. Let’s find out with the examples given below.
Single Line Comment in Javascript
If you want to add a single-line comment, you can use the symbol // at the start of the line, in which you want to comment.
Examples 1
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<script> //This is the function myFun function myFun(){ //document.write("This is the commented line."); document.getElementById("mypara").innerHTML = "This is the new paragraph."; //This is the simple comment } </script> <p id="mypara">Click the below button to see the result.</p> <button type="button" onclick="myFun()">Click Me</button> |
Output
Click below button to see result.
Multi-Line Comments in Javascript
If you want to add multi-line comments in javascript, Use the symbol /* to the start of the comment and */ to the end of the comment. You can use the Javascript multiline comment system to make more than one-line comments.
Examples 2
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<script> /*This is the example to show the javascript multiline comment system. The javascript example does not display the comment line in the output.*/ function myMultiFun(){ /*document.write("This is the commented line."); document.write("This is the second commented line.");*/ document.getElementById("myMultipara").innerHTML = "This is the paragraph to show multiline comment."; } </script> <p id="myMultipara">Click the below button to see the result.</p> <button type="button" onclick="myMultiFun()">Click Me</button> |
Output
Click below button to see result.