Word Count in a Sentence in jQuery

I wrote this program using jQuery to count the number of words in a given sentence.

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Program Listing

<title>Word Count in a Sentence in jQuery</title>
<script type="text/javascript" src="jquery-3.2.1.min.js">
<script type="text/javascript">
   function WordCount(str) {
  	return str.split(" ").length;

$(document).ready(function() { 
var sentence = "jQuery programming is fun.";	
document.write("<h2>Word Count in a Sentence in jQuery</h2>");
document.write("<h3>Sentence : " ,sentence,"</h3>");
count_words = WordCount(sentence);
document.write("<h3>Total Number of Words  : " ,count_words,"</h3>");