jquery text()方法取标签中的文本

<span id="236" class="active" type="teacher" ww="nn">
<input type="checkbox" onclick="event.cancelBubble=true;">
刘4
</span>

$("input:checked",".simpleTree").each(function(){
var currentNode = $(this).parent(); 
var isfolder = currentNode.text(); 
var id=currentNode.attr("id")
alert(isfolder); 

});