如何生成不重复的随机数 javascript

问题描述

我正在使用以下代码生成 0 到 Totalfriends 之间的随机数，我想获取随机数，但它们不应重复.知道怎么做吗?

I am using the following code which generates random number between 0 to Totalfriends, I would like to get the random numbers but they should not be repeated. Any idea how?

这是我正在使用的代码

FB.getLoginStatus(function(response) {
    var profilePicsDiv = document.getElementById('profile_pics');
FB.api({ method: 'friends.get' }, function(result) {

     // var result =resultF.data;
   // console.log(result);
   var user_ids="" ;
   var totalFriends = result.length;
   // console.log(totalFriends);
   var numFriends = result ? Math.min(25, result.length) : 0;
  // console.log(numFriends);
   if (numFriends > 0) {
      for (var i=0; i<numFriends; i++) {
        var randNo = Math.floor(Math.random() * (totalFriends + 1))
        user_ids+= (',' + result[randNo]);
         console.log(user_ids);

          }
        }
        profilePicsDiv.innerHTML = user_ids;
      });
});

推荐答案

这是一个函数，它将从 array 中获取 n 个随机元素，并根据 Fisher-yates shuffle 返回它们.请注意，它将修改 array 参数.

Here's a function that will take n random elements from array, and return them, based off a fisher-yates shuffle. Note that it will modify the array argument.

function randomFrom(array, n) {
    var at = 0;
    var tmp, current, top = array.length;

    if(top) while(--top && at++ < n) {
        current = Math.floor(Math.random() * (top - 1));
        tmp = array[current];
        array[current] = array[top];
        array[top] = tmp;
    }

    return array.slice(-n);
}

假设您的代码按照我的想法运行，那么您已经拥有一组用户 ID:

Assuming your code works how I think it does, you already have an array of userids:

var random10 = randomFrom(friendIds, 10);

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