js两个树形数组取交集

以下是JavaScript获取两个数组交集的方法：

方法一：使用filter()和includes()方法

function getIntersection(arr1, arr2) {
  return arr1.filter(item => arr2.includes(item));
}

// 示例用法
const arr1 = [1, 2, 3, 4, 5];
const arr2 = [4, 5, 6, 7, 8];
const intersection = getIntersection(arr1, arr2);
console.log(intersection); // 输出：[4, 5]

方法二：使用Set对象

function getIntersection(arr1, arr2) {
  const set1 = new Set(arr1);
  const set2 = new Set(arr2);
  return Array.from(new Set([...set1].filter(item => set2.has(item))));
}

// 示例用法
const arr1 = [1, 2, 3, 4, 5];
const arr2 = [4, 5, 6, 7, 8];
const intersection = getIntersection(arr1, arr2);
console.log(intersection); // 输出：[4, 5]