jquery - how to set the child number in a table -

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I can call children manually like this 

  $ (" Tr & gt; td: nth-child (1) tr: nth-child (n + 3) "). AddClass ("ClassName");   
 How to pass this value, I  
  var index = 5 in JavaScript; $ ("Tr> td: nth-child (1) tr: nth-child (" + + "" "). AddClass (" ClassName ");   
 It does not work as it is. My scenario is that we have to find the indicator of a specific column and cross that index value.  $ ("tr & gt; td: nth-child (1)) Tr For the sake of completeness, I also like the @Windered method:    
   
 There is no string formatting bug like this: pre>  $ ("tr & gt; td: nth-child (1) tr"). Eq (zero badge index)  )

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