Uncaught TypeError: Cannot read property 'choices' of undefined

Question

我正在努力提高我的 JavaScript 并且我发现了这个：https://jsbin.com/qacolagedo/edit?html,js,output .

但是在开发者工具中，我得到这个错误：

qacolagedo.js:54 Uncaught TypeError: Cannot read property 'choices' of undefined
    at renderQuestions (qacolagedo.js:54)
    at checkAnswer (qacolagedo.js:72)
    at HTMLInputElement.onclick (runner:1)

如何解决？

提前谢谢你。

Answer 1

调用finished函数后停止执行代码。为此你可以写 return;

else {
    alert("You have a total of " + sumPoints + "/4" + " correct answers!");
    finished();
    return;
}

并且发生错误是因为您尝试从 allQuestions 数组的不存在项中获取 choices。不存在，因为 zCount 超过 allQuestions 数组的长度。

Uncaught TypeError: Cannot read property 'choices' of undefined

Uncaught TypeError: Cannot read property 'choices' of undefined

javascript

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