javascript Convert string representation of hex value to hex -

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How can I represent the hex value string in the representation of hex in javascript?

Am I returning from the checksum routine? I have a string value of "FE". I need this hex representation "\ xFE"

I just can not do this because it gives me a Returns the error: 

  var crc = "FE"; Var hex = "\ x" + crc;   
 This just gives me a new 4 character ASCII string:  
  var crc = "FE"; Var hex = "0x" + "FE";   
 Thxs for any guidance.   
 
 
 like  
  var hex = parsient ("ff" 16);

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