将多个阵列交织成单个阵列

arr1 = [1, 2, 3]
arr2 = [4, 5, 6]
arr1.extend(arr2)
print(arr1)  # 输出：[1, 2, 3, 4, 5, 6]

arr1 = [1, 2, 3]
arr2 = [4, 5, 6]
arr3 = arr1 + arr2
print(arr3)  # 输出：[1, 2, 3, 4, 5, 6]

arr1 = [1, 2, 3]
arr2 = [4, 5, 6]
arr3 = arr1 * 1 + arr2 * 1
print(arr3)  # 输出：[1, 2, 3, 4, 5, 6]

let arr1 = [1, 2, 3];
let arr2 = [4, 5, 6];
let arr3 = arr1.concat(arr2);
console.log(arr3);  // 输出：[1, 2, 3, 4, 5, 6]

let arr1 = [1, 2, 3];
let arr2 = [4, 5, 6];
let arr3 = [...arr1, ...arr2];
console.log(arr3);  // 输出：[1, 2, 3, 4, 5, 6]