從陣列中挑選一個隨機數組元素

Question

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

如果你有一個數組：

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

我怎麼會隨機從這個數組中選擇一個元素？

Answer 1

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

Answer 2

你可以使用

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

Answer 3

如果你想你可以做這一切Array s的通用功能，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();