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判断一个数组是否是另一个数组的子集
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判断一个数组是否为另一个数组的子集，可以使用 JavaScript 中的 every() 方法和 includes() 方法来实现。
假设有两个数组 arr1 和 arr2，可以按照以下方式进行判断：
const isSubset = arr1.every(item => arr2.includes(item));
其中，every() 方法用于判断数组 arr1 中的每一个元素是否都存在于数组 arr2 中，如果都存在，则返回 true，否则返回 false；includes() 方法用于判断数组 arr2 中是否包含指定元素 item，如果包含，则返回 true，否则返回 false。
如果 isSubset 的值为 true，则表示数组 arr1 是数组 arr2 的子集。如果 isSubset 的值为 false，则表示数组 arr1 不是数组 arr2 的子集。
