从数组中挑选一个随机数组元素

Question

  

可能重复：
  How can I return a random value from an array?
  Getting random value from an array

如果你有一个数组：

days = ["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]

我如何从这个数组中随机选择一个元素？

Answer 1

var randomDay = days[Math.floor(Math.random()*days.length)]
document.write(randomDay);

Answer 2

您可以使用

days[Math.floor(Math.random()*days.length)];

Answer 3

如果你想要，你可以将它作为所有Array s的通用函数，即

Array.prototype.getRandomElement = function () {
    return this[Math.floor(Math.random() * this.length)];
};

var days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday",
    randomDay = days.getRandomElement();