三角洲标志破解JavaScript代码

我正在为一个机械网站制作一个JavaScript闪存卡游戏。因为我想在卡片上添加方程式，所以我需要使用增量（Δ）符号。三角洲标志破解JavaScript代码

一张卡片可能有：“一方的功率方程”和另一方的“P = W /Δt”。如果卡从第一面开始，当按下空格键或按下翻盖按钮时，它将翻转。但是，如果它从第二面开始，即带有Δ符号的那一面，当按下“翻转”按钮或空格键时，它不会翻转。

我曾尝试写作Δ不同的方式：

&Delta; &#x0394; &#916;

没有这些工作的。我的代码是：

//Copyright Attribution-ShareAlike 4.0 International 2017 Hazel Meehan 
 

 

 
//array containing all options 
 
var options = [ //counts from 0 
 
    "Joules(J)", "Measure of Work", 
 
    "Watts(W)", "Measure of Power", 
 
    "Ek", "Kinetic Energy", 
 
    "Ep", "Potential Energy", 
 
    "Newtons(N)", "Measure of Force", 
 
    "Pascals(Pa)", "Pressure", 
 
    "ms-1", "Metres per Second", 
 
    "ms-2", "Metres per Second Gained", 
 
    "10N", "Value of Gravity", 
 
    "Weight is a", "Force beginning with W", 
 
    "The capacity to do work", "Energy is", 
 
    "d = &Delta;v&Delta;t is the equation for", "The equation for distance", 
 
    "W=F&Delta;d is the equation for", "The equation for work", 
 
    "P=W/&Delta;t is the equation for", "The equation for power" 
 
]; 
 

 
//initialize variables 
 
var randomNum = 0; 
 
var sideOne = " "; 
 
var sideTwo = " "; 
 

 
//choose new card using random number 
 
var newCard = function() { //runs on 'next' 
 
    var randomNum = Math.floor(Math.random() * options.length); 
 
    sideOne = options[randomNum]; 
 
    if (randomNum % 2 == 0) { //is the number even 
 
    sideTwo = options[randomNum + 1]; 
 
    } else { 
 
    sideTwo = options[randomNum - 1]; 
 
    } 
 
    document.getElementById("card").innerHTML = sideOne; 
 
}; 
 

 
//show other side of card 
 
var flip = function() { //runs on 'flip' 
 
    if (document.getElementById("card").innerHTML == sideOne) { 
 
    document.getElementById("card").innerHTML = sideTwo; 
 
    } else { 
 
    document.getElementById("card").innerHTML = sideOne; 
 
    } 
 
}; 
 

 
//change card on key down 
 
document.onkeydown = function(e) { 
 
    e = e || window.event; 
 
    if (e.keyCode == '39') { //right arow key 
 
    newCard(); 
 
    } else if (e.keyCode == '32') { //space bar 
 
    flip(); 
 
    } 
 
}

<article> 
 
    <h2>Flashcards</h2> 
 
    <center><button id="flashButton" onclick="newCard()">Next</button></center> 
 
    <br> 
 
    <center><button id="card"></button></center> 
 
    <br> 
 
    <center><button id="flashButton" onclick="flip()">Flip</button></center> 
 
</article>

来源

2017-08-12 Hazel Meehan

它在[SO]（https://stackoverflow.com）上工作，你应该为你的html添加一个''标签以便看到它们。 –

适合我。你使用的是什么浏览器？任何记录在控制台？ – marekful

我可以重现这个错误，当我用'Δ'替换'Δ'时，它会消失。 – ASDFGerte