将所有空值最后放入数组中

function moveNullsToEnd(arr) {
  var newArr = [];
  var nullArr = [];
  
  for (var i = 0; i < arr.length; i++) {
    if (arr[i] !== null && arr[i] !== undefined) {
      newArr.push(arr[i]);
    } else {
      nullArr.push(arr[i]);
    }
  }
  
  return newArr.concat(nullArr);
}

// 示例用法
var originalArray = [1, 2, null, 3, null, 4, undefined, 5];
var resultArray = moveNullsToEnd(originalArray);

console.log(resultArray); // 输出：[1, 2, 3, 4, 5, null, null, undefined]