如何随机化多维数组中的测验问题顺序？

Question

var questions =[ 
new Question ("Who is the president of Czech Republic?", ["Donald Trump", "Andrej Kiska", "Milos Zeman", "Angela Merkel"], "Milos Zeman"), 
new Question ("The capital of Czech Republic is:", ["Brno", "Ostrava", "Hradec Kralove", "Prague"], "Prague"), 
new Question ("Which food is not common Czech food?", ["Cevapcici", "Svickova", "Trdelnik", "Tatarak"], "Cevapcici")]; 
var quiz = new Quiz(questions); 
populate(); 

如何随机化测验中问题的顺序？这里是工作示例：

https://jsfiddle.net/yhosftnt/

Answer 1

排序他们通过使用随机数（demo）：

this.questions = [].concat(questions).sort(function() { 
    return Math.random() - Math.random(); 
}); 

的[].concat(questions)创建新的数组，所以原来的阵列将不会改变。