JavaScript supports both C-style and C++-style comments, Thus −
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Any text between a // and the end of a line is treated as a comment and is ignored by JavaScript.
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Any text between the characters /* and */ is treated as a comment. This may span multiple lines.
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JavaScript also recognizes the HTML comment opening sequence <!--. JavaScript treats this as a single-line comment, just as it does the // comment.
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The HTML comment closing sequence --> is not recognized by JavaScript so it should be written as //-->.
