柒柒兮的博客

var nums1 = [1, 2, 2, 1], nums2 = [2, 2, 3, 4]; // 1. var newArr1 = nums1.filter(function(item) { return nums2.indexOf(item) > -1; }); console.log(newArr1); // 2. var newArr2 = nums1.filter((item) => { return nums2.includes(item); }); conso

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