//! 数组的includes方法
// includes() 方法用来判断一个数组是否包含一个指定的值，根据情况，如果包含则返回 true，否则返回 false。
const array1 = [1, 2, 3];

console.log(array1.includes(2));
console.log(array1.includes(2, -2));
// expected output: true

const pets = ['cat', 'dog', 'bat'];

console.log(pets.includes('cat')); // expected output: true
console.log(pets.includes('cat', 1)); // false

console.log(pets.includes('at'));
// expected output: false