The class dictionary implemented by JavaScript inserts or updates method instances

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Code expressed the class dictionary insert or update related ideas, interested friends mainly understand the meaning of the code on the line, not too deep

<script type="text/javascript">
  function insertOrUpdate(array, keyName, keyVal, fieldNames, fieldVals) {
  var hasExist = false;
  var len = array.length;
  for (var i = 0; i < len; i++) {
   if (array[i][keyName] && array[i][keyName] == keyVal) {
   //  Existing updates directly 
   hasExist = true;
   for (var j = 0; j < fieldNames.length; j++) {
    array[i][fieldNames[j]] = fieldVals[j];
   }
   }
  }
  if (!hasExist) {//  Insert if none exists 
   array[len] = {};
   array[len][keyName] = keyVal;
   for (var k = 0; k < fieldNames.length; k++) {
   array[len][fieldNames[k]] = fieldVals[k];
   }
  }
  }
  var orders = [
    {
    "OrderId" : 1,
    "OrderAmount" : {
     "OldValue" : 10,
     "NewValue" : 20
    }
    }, 
    {
    "OrderId" : 2,
    "OrderAmount" : {
     "OldValue" : 20,
     "NewValue" : 30
    }
    }];
  insertOrUpdate(orders, "OrderId", 1, ["OrderAmount"], [{"OldValue": 145, "NewValue": 1125}]);
  console.dir(orders);
  insertOrUpdate(orders, "OrderId", 3, ["OrderAmount"], [{"OldValue": 75, "NewValue": 95}]);
  console.dir(orders);
</script>

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