从一个数组中随机筛选出N不重复数据

//不可重复
function noRepeatFilter(arr, num){
    let newArr = JSON.parse(JSON.stringify(arr));
    let resultData = [];
    for (let i = 0; i < num; i++) {
      let random = Math.floor(Math.random() * newArr.length);
      resultData.push(newArr[random]);
      newArr.splice(random, 1);
    }
    return resultData;
}

//从[1,2,3,4,5,6,7,8,9]随机筛选5位数
console.log(filter([1,2,3,4,5,6,7,8,9], 5))
// 打印结果
[6,8,1,2,1]


//可重复
function filter(arr, num) {
    return new Array(num)
        .fill(1)
        .map(item => arr[Math.floor(Math.random() * arr.length)])
}
//从[1,2,3,4,5,6,7,8,9]随机筛选5位数
console.log(filter([1,2,3,4,5,6,7,8,9], 5))
// 打印结果
[6,8,1,2,1]