如何提取嵌套数组数据并将其存储在JavaScript数组中？

function flattenArray(arr) {
  var result = [];

  arr.forEach(function(item) {
    if (Array.isArray(item)) {
      result = result.concat(flattenArray(item));
    } else {
      result.push(item);
    }
  });

  return result;
}

// 示例用法
var nestedArray = [1, [2, [3, 4], 5], 6];
var flattenedArray = flattenArray(nestedArray);
console.log(flattenedArray);

function flattenArray(arr) {
  var stack = [...arr];
  var result = [];

  while (stack.length) {
    var next = stack.pop();
    if (Array.isArray(next)) {
      stack.push(...next);
    } else {
      result.push(next);
    }
  }

  return result.reverse();
}

// 示例用法
var nestedArray = [1, [2, [3, 4], 5], 6];
var flattenedArray = flattenArray(nestedArray);
console.log(flattenedArray);