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How to count number of divs in jquery in Jquery functions of JQuery Examples
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Length Property and size() Method in JQuery 
length and size methods are returns how many elements are selected by the JQuery selector.

Example
$(element).size()
$(element).length

Hints
size() is a method to read the length property inside of the method. To use length to avoid one method call and get faster response.
Example.1 How to use length property to count number of elements in JQuery?
<html>
    <head>
        <title>HTML-JQuery</title>
        <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
        
        <script type="text/javascript">
            $(function(){
                var n=$(".divControl").length;
                alert(n);  
            });
        </script>
    </head>
    <body>
        <div class="divControl">one</div>
  <div class="divControl">two</div>
  <div class="divControl">three</div>
  <div class="divControl">four</div>
    </body>
</html>
Example.1 Demo 
Example.2 How to count number of element using Size() method of JQuery
<html>
    <head>
        <title>HTML-JQuery</title>
        <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
        
        <script type="text/javascript">
            $(function(){
                var n=$(".divControl").size();
                alert(n);
            });
        </script>
    </head>
    <body>
        <div class="divControl">one</div>
  <div class="divControl">two</div>
  <div class="divControl">three</div>
  <div class="divControl">four</div>
    </body>
</html>
Example.2 Demo 
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