1<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
2<p>Phasellus sit amet auctor velit, ac egestas augue.</p>
3<script>
4jQuery(document).ready(function($){
5
6 $('p').html(function(){
7 // separate the text by spaces
8 var text= $(this).text().split(' ');
9 // drop the last word and store it in a variable
10 var last = text.pop();
11 // join the text back and if it has more than 1 word add the span tag
12 // to the last word
13 return text.join(" ") + (text.length > 0 ? ' <span class="last">'+last+'</span>' : last);
14 });
15
16});
17</script>
18<style>
19span{
20color:red;
21}
22</style>
23
24