Skip to main content

JavaScript Comments

JavaScript Comments

Comments can be added to explain the JavaScript, or to make the code more readable.
Single line comments start with //.
The following example uses single line comments to explain the code:

Example

<script type="text/javascript">
// Write a heading
document.write("<h1>This is a heading</h1>");
// Write two paragraphs:
document.write("<p>This is a paragraph.</p>");
document.write("<p>This is another paragraph.</p>");
</script>

JavaScript Multi-Line Comments

Multi line comments start with /* and end with */.
The following example uses a multi line comment to explain the code:<script type="text/javascript">
/*
The code below will write
one heading and two paragraphs
*/
document.write("<h1>This is a heading</h1>");
document.write("<p>This is a paragraph.</p>");
document.write("<p>This is another paragraph.</p>");
</script>

Using Comments to Prevent Execution

In the following example the comment is used to prevent the execution of a single code line (can be suitable for debugging):

Example

<script type="text/javascript">
//document.write("<h1>This is a heading</h1>");
document.write("<p>This is a paragraph.</p>");
document.write("<p>This is another paragraph.</p>");
</script> In the following example the comment is used to prevent the execution of a code block (can be suitable for debugging):

Example

<script type="text/javascript">
/*
document.write("<h1>This is a heading</h1>");
document.write("<p>This is a paragraph.</p>");
document.write("<p>This is another paragraph.</p>");
*/
</script>

Using Comments at the End of a Line

In the following example the comment is placed at the end of a code line:

Example

<script type="text/javascript">
document.write("Hello"); // Write "Hello"
document.write(" Dolly!"); // Write " Dolly!"
</script>

Comments

Post a Comment

Popular posts from this blog

Toshiba Canada enters all-in-one PC market

Toshiba of Canada has thrown its hat into the all-in-one personal computer (PC) ring with the launch this week of the Toshiba DX730, a 23” all-in-one machine designed for users who want a large display and multimedia features in an environment where space is at a premium. It's Toshiba's first foray into this form factor, said Mini Saluja, national training manager with Toshiba of Canada, building on its experience in the laptop market. The DX730 has a 23” full HD multitouch display with a glossy black finish on an aluminum stand. It comes with a matching Bluetooth keyboard and mouse, and boasts Onkyo stereo speakers with Waves MaxxAudio sound processing. Two models of the DX730 will initially be available. The $899 model features a second-generation Intel Core i3 processor with 4GB of DDR3 memory, a 1TB 7200 RPM hard drive, a DVD SuperMulti Drive and HDMI in. For $1,049, you can move up to a model with an NVIDIA Geforce GT 540M processor and Intel Core i5, as we...
1 comment
Read more

Tropical storm Beryl makes landfall on US coast

The weather system was expected to continue dumping rain over parts of Florida and Georgia. Tropical Storm Beryl made landfall early Monday in northeast Florida, bringing drenching rains and driving winds to the southeastern U.S. coast, forecasters said. The National Hurricane Center in Miami reported that Beryl made landfall over Duval and northern St. John s counties, with near-hurricane-strength winds of 70 mph (113 kph). "There are strong rain bands that are rotating around the center of the storm..." forecaster Al Sandrik said in an audio statement on the NHC website. The weather system was expected to continue dumping rain over parts of Florida and Georgia on Monday. It was expected to weaken as it moves inland and become a tropical depression by Monday night. Tropical storm warnings were in effect for the entire Georgia coastline, as well as parts of Florida and South Carolina. Florida Gov. Rick Scott urged Florida residents in the affected areas to "stay alert ...
Post a Comment
Read more

Don't count on Russia to force out Assad: US senator

"This administration has a feckless foreign policy which abandons American leadership," McCain said. The U.S. can t count on Russia a major arms supplier to Syria to force President Bashar Assad from power, a U.S. senator said Sunday, blaming President Barack Obama for embracing a "feckless" foreign policy and punting tough decisions until after the November election. It was a particularly sharp rebuke for Sen. John McCain, who as a longtime critic of Obama s foreign policy hasn t pulled many punches. As the top Republican on the Senate Armed Services Committee, McCain s viewpoint on complex world events often finds its way into Republican election-year talking points. "This administration has a feckless foreign policy which abandons American leadership," McCain told "Fox News Sunday." "What the conclusion you can draw is that this president wants to kick the can down the road on all of these issues until after the election ... it s really...
Post a Comment
Read more