删除重复并合并Javascript数组的值

function mergeUniqueArrays(arr1, arr2) {
  var mergedArray = arr1.concat(arr2); // 合并两个数组

  var uniqueArray = [];
  for (var i = 0; i < mergedArray.length; i++) {
    if (uniqueArray.indexOf(mergedArray[i]) === -1) {
      uniqueArray.push(mergedArray[i]);
    }
  }

  return uniqueArray;
}

var arr1 = [1, 2, 3];
var arr2 = [2, 3, 4, 5];
var mergedUniqueArray = mergeUniqueArrays(arr1, arr2);
console.log(mergedUniqueArray); // 输出 [1, 2, 3, 4, 5]