挑选一个随机的json对象 [英] Picking a random json object

问题描述

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 ] ）。如何随机选择？

I need to be able to pick an Array item randomly (e.g. ["Pineapple","P"]). How can I do a random pick?

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

推荐答案

只需 Math.random （）并将数组的长度作为因子。

Just take Math.random() and the length of the array as factor.

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]);

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