各位！

我正在尝试使用 JavaScript 构建一个基本的测验应用程序，但遇到了一个小“问题”

为什么我的代码没有将 allQuestions 数组的元素存储在 currentQuestion 变量中？

这是代码：

var allQuestions = [
            {question: 'What is the first letter of the alphabet?',
             choices: ['a', 'b', 'c', 'd'],
             correctAnswer: 0
            },
            {
             question: 'What is the second letter of the alphabet?',
             choices: ['a', 'b', 'c', 'd'],
             correctAnswer: 1    
            },
            {
             question: 'What is the third letter of the alphabet?',
             choices: ['a', 'b', 'c', 'd'],
             correctAnswer: 2    
            },
            {
             question: 'What is the last letter of the alphabet?',
             choices: ['a', 'b', 'c', 'z'],
             correctAnswer: 3    
            }];

var currentQuestion = {};

function pickRandomQuestion(arr) {
    return this[Math.floor(Math.random() * this.length)];
}

currentQuestion = pickRandomQuestion(allQuestions);

谢谢！