使用highlight.js库如何为HTML源代码添加行号？

<pre class="brush:php;toolbar:false"> {
    position: relative;
    margin-bottom: 24px;
    border-radius: 3px;
    border: 1px solid #C3CCD0;
    background: #FFF;
    overflow: hidden;
}

code {
    display: block;
    padding: 12px 24px;
    overflow-y: auto;
    font-weight: 300;
    font-family: Menlo, monospace;
    font-size: 0.8em;
}

code.has-numbering {
    margin-left: 21px;
}

.pre-numbering {
    position: absolute;
    top: 0;
    left: 0;
    width: 20px;
    padding: 12px 2px 12px 0;
    border-right: 1px solid #C3CCD0;
    border-radius: 3px 0 0 3px;
    background-color: #EEE;
    text-align: right;
    font-family: Menlo, monospace;
    font-size: 0.8em;
    color: #AAA;
}

<link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/styles/default.min.css">
<script src="http://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/highlight.min.js"></script>

<script>
    hljs.highlightAll();
    $(function () {
        $('pre code').each(function () {
            var lines = $(this).text().split('\n').length - 1;
            var $numbering = $(' <ul></ul>').addClass('pre-numbering');
            $(this)
                .addClass('has-numbering')
                .parent()
                .append($numbering);
            for (i = 1; i <= lines; i++) {
                $numbering.append($(' <li></li>').text(i));
            }
        });
    });
</script>