jQuery selector returns a jQuery object that has .lenght property. So the easiest way to get the length is using the .lenght property.
var iCount = $('.cssClass').length;
If you want to know how many div elements present on the page then,
var eCount = $('div').length;
jQuery also provides .size() method, which also does the same thing as the .lenght property. But the .lenght property is preferred because it does not have the overhead of a function call.
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Have a nice day... 'N happy Coding :)
