includes()

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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));
// expected output: true

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

console.log(pets.includes("cat"));
// expected output: true

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