javascript - Target only one element with jQuery -

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I have a small problem with my code, and though I can stack overflow people know how to To solve.

Here's the scenario:

I have to add strong inside p to another element that will have post captions. I am able to solve it, but I am having problems. Photo caption duplicates in other similarly named elements, which I do not want to do. So the post caption can be in the post, but not always, but it still has to work.

HTML 

  & lt; Div class = "post" & gt; & Lt; P & gt; Advertising for advertising did not matter either at any time; Information about Donak Penders at Morris Laurem & Lt; / P & gt; & Lt; / Div & gt; & Lt; Div class = "post" & gt; & Lt; P & gt; Advertising for advertising did not matter either at any time; Information about Donak Penders at Morris Laurem & Lt; / P & gt; & Lt; / Div & gt; & Lt; Div class = "post" & gt; & Lt; P & gt; Advertising for advertising did not matter either at any time; Information about Donak Penders at Morris Laurem & Lt; / P & gt; & Lt; P & gt; & Lt; Strong & gt; This is the caption. & Lt; / Strong> & Lt; / P & gt; & Lt; / Div & gt;

JS 

  var $ caption = $ ("strong: first-child"). Text (); Var $ removable = $ ("strong post: first-child"); $ ("Strong: first-child"). mother-father (). Remove (); $ Removable.remove (); $ ("Post"). App ("& lt; p class = 'post-caption' & gt;" + $ Caption + "");   
  
  
  
  
  
 Div class = "post -text "itemprop =" text "> 
  $ (" strengthen: first-child "). mother-father (). Remove (); In  strong  each  .post  first. 
 
 If you want the first  .post  you want to  $ ('(' strong '');  or  $ ('.post: first -Bar strong ');

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