IE的javascript findIndex问题

function findIndex(arr, callback) {
  for (var i = 0; i < arr.length; i++) {
    if (callback(arr[i], i, arr)) {
      return i;
    }
  }
  return -1;
}

var arr = [1, 2, 3, 4, 5];
var index = findIndex(arr, function(element) {
  return element === 3;
});
console.log(index); // 输出2

var arr = [1, 2, 3, 4, 5];
var index = arr.indexOf(arr.filter(function(element) {
  return element === 3;
})[0]);
console.log(index); // 输出2