The function of the comment is to improve the readability of the code, to help yourself and others read and understand the JavaScript code you write.
The content of the comment will not be displayed on the web page.
Comments can be divided into
- single-line comments
- multi-line comments.
For the convenience of reading, we generally put the comment content at or around the end of the statement that needs to be explained.
For single-line comments, add the symbol "//" before the content of the comment.
<script type="text/javascript">
document.write("Single-line comments use '//'");
// I am a single line comment
</script>
Multi-line comments start with /* and end with */
<script type="text/javascript">
document.write("Multi-line comments use /*comment content*/");
/*
multiline comment
Develop a good habit of writing notes
*/
</script>
Task - Exercise - 6
1. Use the symbol // to turn document.write("hello") to a single line comment.
2. Use /* and */ to turn the text content of lines 8, 9, and 10 into comments
Task Code
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Hidden comments</title>
<script type="text/javascript">
document.write("Hello");
do you know
JS can achieve many dynamic effects
Come and learn!
</script>
</head>
<body>
</body>
</html>
