递归的独立函数，可以返回任意数量的项(与lodash.sampleSize相同):

function getRandomElementsFromArray(array, numberOfRandomElementsToExtract = 1) {
    const elements = [];

    function getRandomElement(arr) {
        if (elements.length < numberOfRandomElementsToExtract) {
            const index = Math.floor(Math.random() * arr.length)
            const element = arr.splice(index, 1)[0];

            elements.push(element)

            return getRandomElement(arr)
        } else {
            return elements
        }
    }

    return getRandomElement([...array])
}

为了寻找一句真正的俏皮话，我得出了这个结论:

['January', 'February', 'March'].reduce((a, c, i, o) => { return o[Math.floor(Math.random() * Math.floor(o.length))]; })

下面是一个如何做到这一点的例子:

$scope.ctx.skills = data.result.skills;
    $scope.praiseTextArray = [
    "Hooray",
    "You\'re ready to move to a new skill", 
    "Yahoo! You completed a problem", 
    "You\'re doing great",  
    "You succeeded", 
    "That was a brave effort trying new problems", 
    "Your brain was working hard",
    "All your hard work is paying off",
    "Very nice job!, Let\'s see what you can do next",
    "Well done",
    "That was excellent work",
    "Awesome job",
    "You must feel good about doing such a great job",
    "Right on",
    "Great thinking",
    "Wonderful work",
    "You were right on top of that one",
    "Beautiful job",
    "Way to go",
    "Sensational effort"
  ];

  $scope.praiseTextWord = $scope.praiseTextArray[Math.floor(Math.random()*$scope.praiseTextArray.length)];

方法1:

使用Math.random()函数获取(0- 1,1)之间的随机数 独家)。 将其乘以数组长度得到数字 (0-arrayLength)之间。 使用Math.floor()获取索引范围 从(0到arrayLength-1)。

Const arr = ["foo"，"bar"]; const randomlyypickedstring =arr[Math.floor(Math.random() * arr.length)]; console.log (randomlyPickedString);

方法2:

random(a, b)方法用于生成(a到b, b不排除)之间的数字。 取下限值，使数字范围从(1到arrayLength)。 减去1得到从(0到arrayLength-1)的下标。

const arr = [“foo”，“bar”]; const randomlyPickedString=arr[Math.floor（random（1， 5））-1]; console.log（randomlyPickedString）;

在我看来，与其把原型搞得乱七八糟，或者及时声明，我更喜欢把它暴露在窗口:

window.choice = function() {
  if (!this.length || this.length == 0) return;
  if (this.length == 1) return this[0];
  return this[Math.floor(Math.random()*this.length)];
}

现在，在你的应用程序的任何地方，你可以这样称呼它:

var rand = window.choice.call(array)

这样你仍然可以正确地使用for(x in array)循环

获取随机元素的通用方法:

让some_array =[‘简’,2月,3月,4月,“可能”); Let months = random_elems(some_array, 3); console.log(个月); 函数random_elems(arr, count) { 让len = arrr .length; 让查找= {}; Let TMP = []; If (count > len) Count = len; 对于(设I = 0;I < count;我+ +){ 让指数; {做 index = ~~(Math.random() * len); } while(查找中的索引); 查找[index] = null; tmp.push (arr(指数)); ｝ 返回tmp; ｝