1. Use getElementsByTagName to modify the class category or append the category
The code copy is as follows:
<ul onclick="clickz()">
<p>First</p>
<p>First</p>
<p>First</p>
<p>First</p>
</ul>
<script type="text/javascript">
function clickz(){
var ulo = document.getElementsByTagName("ul")[0];
ulo.className = "name2";//Modify<br> //ulo.className += "name2"; //For append categories
} </script>