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How to comment out a certain line of code in JavaScript: 1. Use "//" to comment out a single line of code, and the syntax is "//single line code"; 2. Use "/*" as the beginning, and use " */" can be used to comment multiple lines of code at the end, and the syntax is "/* multi-line code */".
The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.
How to comment out a certain line of code in JavaScript
javascript single-line comments
Single-line comments start with "//" and go to End at the end of the redirected line. The following is an example of a javascript single-line comment:
<html>
<head>
<title>javascript单行注释</title>
<script language="javascript">
<!--
// The first alert is below
alert("An alert triggered by JavaScript!");
// Here is the second alert
alert("A second message appears!");
// -->
</script>
</head>
<body>
</body>
</html>javascript multi-line comment
Multi-line comments start with /* and end with */. The following example uses multi-line comments to explain the code:
<html>
<head>
<title>javascript多行注释</title>
<script language="javascript">
<!--
/*
Below two alert() methods are used to
fire up two message boxes - note how the
second one fires after the OK button on the
first has been clicked
*/
alert("An alert triggered by JavaScript!");
alert("A second message appears!");
// -->
</script>
</head>
<body>
</body>
</html>[Related recommendations: javascript learning tutorial]
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