JavaScript Comments
JavaScript Comments
Comments can be added to explain the JavaScript, or to make it more readable.
Single line comments start with //.
This example uses single line comments to explain the code:
<script type="text/javascript">
// This will write a header:
document.write("<h1>This is a header</h1>");
// This will write two paragraphs:
document.write("<p>This is a paragraph</p>");
document.write("<p>This is another paragraph</p>");
</script>
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Try it yourself.
JavaScript Multi-Line Comments
Multi line comments start with /* and end with */.
This example uses a multi line comment to explain the code:
<script type="text/javascript">
/*
The code below will write
one header and two paragraphs
*/
document.write("<h1>This is a header</h1>");
document.write("<p>This is a paragraph</p>");
document.write("<p>This is another paragraph</p>");
</script>
|
Try it yourself.
Using Comments to Prevent Execution
In this example the comment is used to prevent the execution of a single code line:
<script type="text/javascript">
document.write("<h1>This is a header</h1>");
document.write("<p>This is a paragraph</p>");
//document.write("<p>This is another paragraph</p>");
</script>
|
Try it yourself.
In this example the comments is used to prevent the execution of multiple code lines:
<script type="text/javascript">
/*
document.write("<h1>This is a header</h1>");
document.write("<p>This is a paragraph</p>");
document.write("<p>This is another paragraph</p>");
*/
</script>
|
Try it yourself.
Using Comments at the End of a Line
In this example the comment is placed at the end of a line:
<script type="text/javascript">
document.write("Hello"); // This will write "Hello"
document.write("Dolly"); // This will write "Dolly"
</script>
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Gayabo
posted by Computer @ 10:42,
0 Comments:
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