jquery - How to get nth-child number of a element -


I do not need the .index () value.

For example. When I have a list: 

  & lt; Ul & gt; & Lt; Li class = "alpha" & gt; & Lt; / li & gt; & Lt; Li class = "alpha" & gt; & Lt; / li & gt; & Lt; Li class = "alpha" & gt; & Lt; / li & gt; & Lt; li class = "beta" & gt; & Lt; / li & gt; & Lt; li class = "alpha" & gt; & Lt; / li & gt; & Lt; Li class = "beta" & gt; & Lt; / li & gt; & Lt; li class = "beta" & gt; & Lt; / li & gt; & Lt; li class = "alpha" & gt; & Lt; / li & gt; & Lt; li class = "beta" & gt; & Lt; / li & gt; & Lt; li class = "beta" & gt; & Lt; / li & gt; & Lt; / Ul & gt;   
 I need to get the order number of each class, and the index count is to ignore the second class in the list, so I need something that should work like this:  
  JQ ('ul li'). No ('beta'). Get each (function () {jQuery (this) .text (nth-child (this number) here;});   
 and then the result will be  
  & lt; Ul & gt; & Lt; Li class = "alpha" & gt; 1 & lt; / li & gt; & Lt; Li class = "alpha" & gt; 2 & lt; / li & gt; & Lt; Li class = "alpha" & gt; 3 & lt; / li & gt; & Lt; Li class = "beta" & gt; & Lt; / li & gt; & Lt; Li class = "alpha" & gt; 4 & lt; / li & gt; & Lt; Li class = "beta" & gt; & Lt; / li & gt; & Lt; Li class = "beta" & gt; & Lt; / li & gt; & Lt; Li class = "alpha" & gt; 5 & ​​lt; / li & gt; & Lt; Li class = "beta" & gt; & Lt; / li & gt; & Lt; Li class = "beta" & gt; & Lt; / li & gt; & Lt; / Ul & gt;   
 I can do the same with other classes like:  
  jQuery ('ul li'). No ('alpha'). Get each (function () {jQuery (this) .text (nth-child (this number) here;});   
 And this is the result  
    
 Please   
 
 
  every  The function has an index value:  
  jQuery ('ul li'). No ('beta'). Each (function (index) {var count = index + 1; jquery (this) .text (count);});

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