挑选一个随机的json对象

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"] ）。 我该怎么做随机选择？

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

Answer 1

只需将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]);