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Javascrip comment characters are divided into single-line comment characters "//" and multi-line comment characters "/**/". Single-line comments start with "//", followed by the comment content, and the syntax is "//comment content"; multi-line comments start with "/*" and end with "*/" ending with the comment content in the middle. The syntax is "/* comment content*/" .
JavaScript Comments
JavaScript will not execute comments.
We can add comments to explain JavaScript or improve the readability of the code.
Single-line comments start with //.
Example
The following example uses a single-line comment to explain the code:
<!DOCTYPE html>
<html>
<body>
<h1>Welcome to my Homepage</h1>
<p>This is my first paragraph.</p>
<script>
// 输出标题：
document.getElementById("myH1").innerHTML="Welcome to my Homepage";
// 输出段落：
document.getElementById("myP").innerHTML="This is my first paragraph.";
</script>
<p><b>注释：</b>注释不会被执行。</p>
</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:
Example
<!DOCTYPE html>
<html>
<body>
<h1>Welcome to my Homepage</h1>
<p>This is my first paragraph.</p>
<script>
/*
下面的这些代码会输出
一个标题和一个段落
并将代表主页的开始
*/
document.getElementById("myH1").innerHTML="Welcome to my Homepage";
document.getElementById("myP").innerHTML="This is my first paragraph.";
</script>
<p><b>注释：</b>注释块不会被执行。</p>
</body>
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