pug - Correct usage of setting a variable (i of for loop) as a class selector in Jade -

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I am trying to create a list with each item respectively whose class is related to its respective order 

  & lt; ol & gt; & Lt; Li class = "1" & gt; 1 & lt; / li & gt; & Lt; Li class = "2" & gt; 2 & lt; / li & gt; & Lt; Li class = "3" & gt; 3 & lt; / li & gt; ... & lt; / ol & gt;   
 using the loop in Z  
  ol - for (var i = 1; i & lt ; = 8; i ++) {li (class = '! {I}')! {I} -}   
 Although this is not working  
   
 What needs to be improved here?   
 
 
 string projection syntax is  # {variable} , not ! {Variable} :  
  li (class = '# {i}')! {I} // or just li (class = i)! {I}   
 Also, when you    vs  # ii  for  li  For content, HTML institutions in the past will be saved while not later.

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