Pouvez vous m'expliquer ce bout de code

function textCounter(theField,theCharCounter,theLineCounter,maxChars,maxLines,maxPerLine)

        var strTemp = "";
 var strLineCounter = 0;
 var strCharCounter = 0;
 for (var i = 0; i < theField.value.length; i++)
 {

  var strChar = theField.value.substring(i, i + 1);
  console.log(strChar);
  if (strChar == '\n')
  {
   strTemp += strChar;
   strCharCounter = 1;
   strLineCounter += 1;
  }
  else if (strCharCounter == maxPerLine)
  {
   strTemp += '\n' + strChar;
   strCharCounter = 1;
   strLineCounter += 1;
  }
  else
  {
   strTemp += strChar;
   strCharCounter ++;
  }
 }
 theCharCounter.value = maxChars - strTemp.length;
 theLineCounter.value = maxLines - strLineCounter;
}