求两个数组的交集(Javascript)

一、方法一

function getResult(arr1, arr2) {let i &＃61; 0;let j &＃61; 0;let res &＃61; [];while(i < arr1.length && j < arr2.length) {if(arr1[i] &＃61;&＃61;&＃61; arr2[j]) {res.push(arr1[i]);i&＃43;&＃43;;j&＃43;&＃43;;}else if(arr1[i] < arr2[j]) {i&＃43;&＃43;;}else {j&＃43;&＃43;;}}return res;
}
let arr1 &＃61; [1, 2, 2, 3];
let arr2 &＃61; [1, 2, 4];
let res &＃61; getResult(arr1, arr2);
console.log(res);//[1,2]


二、方法二

function getResult(arr1, arr2) {let res;res &＃61; arr1.filter((item) &＃61;> {return arr2.includes(item);})return [...new Set(res)];//去重
}
let arr1 &＃61; [1,2,2,3];
let arr2 &＃61; [1,2,4];
let res &＃61; getResult(arr1, arr2);
console.log(res);//[1,2]