我在浏览jquery tooltip时发现了这段代码。请解释一下为什么要使用这段代码以及它的含义是什么?
<pre class="prettyprint">
<head>
<script>
$(document).ready(function() {
$('.tooltip').tooltipster({
contentAsHTML: true
});
});
</script>
</head>
<body>
<div class="tooltip" title="&lt;img src=&quot;my- image.png&quot; /&gt; &lt;strong&gt; This text is in bold case !&lt;/strong&gt;">
This div has a tooltip with HTML when you hover over it!
</div>
</body></pre>