如何在Javascript中的findIndex回调函数中接受动态输入？

function findIndexWithDynamicInput(arr, dynamicInput) {
  let index = -1;
  arr.findIndex(function(element, i) {
    if (element === dynamicInput) {
      index = i;
      return true;
    }
  });
  return index;
}

function findIndexWithDynamicInput(arr, dynamicInput) {
  return arr.findIndex((element, i) => element === dynamicInput);
}

function findIndexWithDynamicInput(arr, dynamicInput) {
  return arr.findIndex(function(element, i) {
    return element === this;
  }.bind(dynamicInput));
}