将嵌套数组转换为单一数组

function flattenArray(nestedArray) {
  var result = [];
  
  for (var i = 0; i < nestedArray.length; i++) {
    if (Array.isArray(nestedArray[i])) {
      result = result.concat(flattenArray(nestedArray[i]));
    } else {
      result.push(nestedArray[i]);
    }
  }
  
  return result;
}

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