javascript - hasClass jQuery isn't working -

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I am working on a navigation system where the left and right arrows extend the LIs. 

  & lt; a href = "#" square = "icon-arrow-left active" & gt; & Lt; / A & gt; & Lt; Ul & gt; & Lt; Li class = "contracted" & gt; & Lt; A href = "#" & gt; 1 & lt; / A & gt; & Lt; / li & gt; & Lt; li class = "extended" & gt; & Lt; A href = "#" & gt; 2 & lt; / A & gt; & Lt; / li & gt; & Lt; li class = "active placement" & gt; & Lt; A href = "#" & gt; 3 & lt; / A & gt; & Lt; / li & gt; & Lt; li class = "extended" & gt; & Lt; A href = "#" & gt; 4 & lt; / A & gt; & Lt; / li & gt; & Lt; Li class = "contracted" & gt; & Lt; A href = "#" & gt; 5 & ​​lt; / A & gt; & Lt; / li & gt; & Lt; / Ul & gt; & Lt; A href = "#" square = "icon icon-arrow-right active" & gt; & Lt; / A & gt; When the fist is 'extended', 'icon-arrow-left' should be 'inactive' and when the last le 'extended' icon should be 'icon-arrow-correct'.  
 I tried to use it, but not working  
  if ($ ('li: first-child'). Haclas ('active placement')) { $ ('Atre (' square ',' inactivated ')}   
 is

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