Q:

.replaceWith() is not working in jQuery 1.9+

I'm trying to clone a <textarea> and clone and replace the digit in the label <label> Number 1 <label> increasing by 1 each time the add button is pressed (So the first label will have Number 1, the label underneath Number 2 etc). 
This works with jQuery 1.8 and below but anything above does not clone and add 1 to the digit.
HTML  
<div>
 <label for="number">Number <span class="one">1</span></label>
 <textarea id="number"></textarea>
</div>
<button>Add</button>

jQuery
var $row = $('div').clone(),
    cloneCount = 2;

$('button').click(function () {
    $row.clone().insertBefore($("button"));
    $('span').clone().attr('span', cloneCount++).replaceWith($('[class=one]:last')).text(cloneCount - 1);
});

JSFIDDLE: http://jsfiddle.net/wba6jvkj/

A:

I don't know what you were attempting with .attr('span' and why it seemed to work in < 1.8, or why you are subtracting one from cloneCount, but this should do what you want:
var $row = $('div').clone(),
    cloneCount = 2;

$('button').click(function () {
    $row.clone().insertBefore($("button"));
    $('span.one:last').text(cloneCount++);
});

jsFiddle example

