javascript - 选择一个随机的 json 对象

Question

我有 json 数据。

[
["Mango","M"],
["Lychee","L"],
["Pineapple","P"],
["Banana","B"]
]

我需要能够随机选择一个数组项(例如 ["Pineapple","P"])。我怎样才能随机选择？

var alphabetNum = "";
$.ajax (
   { 
    url:"getalphabet.json"
   }).done(function(data) {
        alphabetNum = data;
});

Answer 1

只需取 Math.random() 和数组的长度作为因子。

var array = [
    ["Mango","M"],
    ["Lychee","L"],
    ["Pineapple","P"],
    ["Banana","B"]
];
var randomItem = array[Math.random() * array.length | 0];

// take only the element with index 0
alert(randomItem[0]);