includes()：建立指定函式，由原陣列過濾指定函數產生新陣列

includes():方法確定數組是否在其條目中包含某個值，返回true或 false

const array1 = [1, 2, 3];

console.log(array1.includes(2));
//  true

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

console.log(pets.includes('cat'));
//  true

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