大家好我不知道为什么我的其他if语句不起作用，因为我打算让它们单击按钮运行，而其他每个问题都会运行，直到其中一个为真，并返回'正确'或'错误'的方框。我的其他if语句是否正确调用？如果是这样，我正确指的是'correctAnswer'吗？在此先感谢！:)（哦，顺便说一下'错误'和'正确'div的显示样式在外部CSS样式表中设置为'none'）
Javascript：
var gameOn = false;
var score;
var interval;
Array.prototype.shuffle = function(){
var i = this.length, j, temp;
while(--i > 0){
j = Math.floor(Math.random() * (i+1));
temp = this[j];
this[j] = this[i];
this[i] = temp;
}//while loop bracket
return this;
}
function stopGame() {
gameOn = false;
if (interval) {
clearInterval(interval);
interval = null;
}//if interval bracket
document.getElementById("startreset").innerHTML = "Start Game";
document.getElementById("time-remaining").style.display = "";
}//function stopGame bracket
//if we click on the start/reset
document.getElementById("startreset").onclick = function () {
//if we are not playing
if (gameOn) {
stopGame();
}/*if gameOn bracket*/ else {
//change mode to playing
gameOn = true;
//set score to 0
score = 0;
document.getElementById("scorevalue").innerHTML = score;
//show countdown box
document.getElementById("time-remaining").style.display = "block";
document.getElementById("startreset").innerHTML = "Reset Game";
var counter = 60;
//reduce time by 1sec in loops
interval = setInterval(timeIt, 1000);
function timeIt(){
document.getElementById("timer-down").innerHTML = counter;
counter--;
//timeleft?
//no->gameover
if ( counter === 0) {
stopGame();
document.getElementById("game-over").style.display = "block";
document.getElementById("game-over").innerHTML = "Game Over" + "<br />" + "<br />" + "Your Score is " + score + "!";
}//if counter bracket
}//timeIt function bracket
//generate new Q&A
generateQA();
function generateQA(){
//this is the first number in the equation
var Na = 1+ Math.round(Math.random() * 9);
//this is the second number in the equation
var Nb = 1+ Math.round(Math.random() * 9);
//the correct answer is when you multiply both together
correctAnswer = Na * Nb;
//these are the randomly generated wrong answers
var w1 = 1+ Math.round(Math.random() * 16);
var w3 = 1+ Math.round(Math.random() * 22);
var w4 = 1+ Math.round(Math.random() * 92);
document.getElementById("question").innerHTML = Na + "x" + Nb;
console.log(correctAnswer);
var myArray = [w1, correctAnswer, w3, w4];
var result = myArray.shuffle();
document.getElementById("box1").innerHTML = result[0];
document.getElementById("box2").innerHTML = result[1];
document.getElementById("box3").innerHTML = result[2];
document.getElementById("box4").innerHTML = result[3];
}//generateQA function bracket
function evaluateAnswer(){
var a = document.getElementById("correct");
var b = document.getElementById("wrong");
if ('box1' === correctAnswer){
a.style.diplay = 'block';
generateQA();
}else if('box1' !== correctAnswer){
b.style.diplay = 'block';
}else if('box2' === correctAnswer){
a.style.diplay = 'block';
generateQA();
}else if('box2' !== correctAnswer){
b.style.diplay = 'block';
}else if('box3' === correctAnswer){
a.style.diplay = 'block';
generateQA();
}else if('box3' !== correctAnswer){
b.style.diplay = 'block';
}else if('box4' === correctAnswer){
a.style.diplay = 'block';
generateQA();
}else if('box4' !== correctAnswer){
b.style.diplay = 'block';
}
}//evaluateAnswer function bracket
}//else statement bracket
}//startreset button function bracket
HTML：
<div id="correct">
Correct!
</div>
<div id="wrong">
Try Again
</div>
<div id="question">
<span id="firstInt"></span><span id="secondInt"></span>
</div>
<div id="instruction">
Click on the Correct Answer
</div>
<div id="choices">
<div id="box1" onclick = "evaluateAnswer()" class="boxes"></div>
<div id="box2" onclick = "evaluateAnswer()" class="boxes"></div>
<div id="box3" onclick = "evaluateAnswer()" class="boxes"></div>
<div id="box4" onclick = "evaluateAnswer()" class="boxes"></div>
</div>
<div id="startreset">
Start Game
</div>
答案 0 :(得分：1)
除了对你的问题的评论之外，你的逻辑也被打破了。
if ('box1' === correctAnswer()){
a.style.diplay = 'block';
generateQA();
}else if('box1' !== correctAnswer()){
b.style.diplay = 'block';
}
您的第一个if和第二个if是互斥的，这意味着这两个中的一个将永远为真。所有其他else操作都不会执行。
更新 - 包含基于您最新评论的更改。
由于您只是想表明答案是否正确，请尝试以下方法：
您需要将result的位置移至全局：
var result = [];
如果结果是全局变量，那么您可以将代码的其余部分更改为：
function evaluateAnswer(box){
var a = document.getElementById("correct");
var b = document.getElementById("wrong");
if (result[box] === correctAnswer) {
a.style.diplay = 'block';
b.style.diplay = 'none';
generateQA();
} else {
a.style.diplay = 'none';
b.style.diplay = 'block';
}
}//evaluateAnswer function bracket<div id="correct">Correct!</div>
<div id="wrong">Try Again</div>
<div id="question">
<span id="firstInt"></span>
<span id="secondInt"></span>
</div>
<div id="instruction">
Click on the Correct Answer
</div>
<div id="choices">
<div id="box1" onclick="evaluateAnswer(0)" class="boxes"></div>
<div id="box2" onclick="evaluateAnswer(1)" class="boxes"></div>
<div id="box3" onclick="evaluateAnswer(2)" class="boxes"></div>
<div id="box4" onclick="evaluateAnswer(3)" class="boxes"></div>
</div>
<div id="startreset">
Start Game
</div>
这一行：
if (result[box] === correctAnswer) {
将测试是否点击了正确的框。
这是更改过的HTML：
<div id="box1" onclick="evaluateAnswer(0)" class="boxes"></div>
<div id="box2" onclick="evaluateAnswer(1)" class="boxes"></div>
<div id="box3" onclick="evaluateAnswer(2)" class="boxes"></div>
<div id="box4" onclick="evaluateAnswer(3)" class="boxes"></div>
当用户点击各个框时，onClick处理程序调用{{1}}函数并传入该框的索引被单击。 evaluateAnswer到0表示存储在3数组中的方框号以及答案索引。 result为0，results[0]为1等。
由于您将答案存储在results[1]数组中，因此您只需要在用户点击的内容和该框的答案之间进行协调。如果他们点击框1，则会调用results。该函数使用evaluateAnswer(0)在0中查找答案。如果这是正确的答案，那么您将显示正确的消息。否则，它会显示错误的消息。
答案 1 :(得分：0)
如果这对你有所帮助，我不会这样做，但我重命名了你的一些功能，因为它们没有意义。此外，如果你要将很多变量命名为最佳，那么就像下面这样做。你也错过了正确div的结尾div。如果你做一个简单的if / else语句，最好使用三元运算符。
auto quadraticExp (double a, double b, double c)
-> std::function<double(double)>
{
auto f1 = [=](double x)
{
std::cout<<a<<" "<<b<<" "<<c<<" "<<x<<std::endl;
return ( a*std::pow(x,2) + b*x + c );
};
f1(42); // use of f1 inside the function
return f1;
}