How can get comment id from comment link?

Based on your comment, you can get the comment ID via JavaScript, and here’s a sample function you can use/try:

<script>
function getCommentIdFromUrl( url ) {
    return (
        ( url && /#comment-(\d+)$/.test( url ) ) ||
        ( location.hash && /^#comment-(\d+)$/.test( location.hash ) )
    ) && RegExp.$1;
}
</script>

So if the URL of the current page is http://example.com/hello-world/#comment-76, getCommentIdFromUrl() would return 76.

Alternatively, you could ignore the above function and use the second expression with a variable, like so:

var comment_ID = location.hash && /^#comment-(\d+)$/.test( location.hash ) && RegExp.$1;

Hope that helps.

[EDIT] In reply to your comment on my answer, you can ignore all the above code, and use this instead:

var
    // Check if the current URL ends with a #comment-123, where 123 is the comment ID.
    is_comment_link = /#comment-(\d+)$/.test( location.href ),

    // Removes the #comment- portion from the URL hash, and get the comment ID.
    comment_ID = is_comment_link && location.hash.substring(9);

Or you could also use:

var is_comment_link, comment_ID;

if ( /#comment-(\d+)$/.test( location.href ) ) {
    is_comment_link = true;
    comment_ID = RegExp.$1;
}

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