Question

如何从数组中获取没有重复的随机项？

我有一系列元素，比如

var a = ["Mango", "Orange", "Banana", "Apple", "Grapes", "Berry", "Peach"]

我想从数组a

中获取3个随机项

var random = ["Banana", "Berry", "Peach"]

Answer 1

var a = ["Mango","Orange","Banana","Apple","Grapes","Berry","Peach"]
var res = a.sort(function() {
  return 0.5 - Math.random();
});
console.log(res.slice(a,3))

Answer 2

试试这个： -

var a = ["Mango","Orange","Banana","Apple","Grapes","Berry","Peach"]
b = _.shuffle(a).slice(0,5);
console.log(b);

Answer 3

这应该没有任何重复：

const a = ["Mango","Orange","Banana","Apple","Grapes","Berry","Peach"]
const b = a.slice()
const newArr = [];

for(let i= 0; i<3; i++){
 let arr = b[Math.floor(Math.random()*b.length)];
  
 let index = b.indexOf(arr);
  
  b.splice(index, 1 );
  
  newArr.push(arr)
  
}

console.log(newArr)

Answer 4

＆＃13;

var a = ["Mango","Orange","Banana","Apple","Grapes","Berry","Peach"];

function searchRandom(count, arr){
  let answer = [], counter = 0;
 
  while(counter < count){
    let rand = arr[Math.floor(Math.random() * arr.length)];
    if(!answer.some(an => an === rand)){
      answer.push(rand);
      counter++;
    }
  }
  
  return answer;
}

console.log(searchRandom(3,a))

＆＃13;

使其灵活支持您想要的任何count并确保唯一性

数组中的随机项没有重复使用javascript？

4 个答案: