Javascript If语句检查全局变量，但同时运行这两个条件

我的头撞到墙上了，请帮帮我：(

编辑：该脚本在JSFIDLE（我自己的服务器）上工作，但在客户机的服务器上不工作：/

我有一个基于全局变量的简单价格切换器。我想使用全局变量，因为切换器包含：文本即折扣（可点击）、样式化复选框（带颜色）、文本（可点击）即打折-这样我可以将侦听器添加到带有文本的可单击

span

元素中，并更改设置样式的

复选框的颜色等

折扣按钮的代码：

<p class="prices-starter-switch">
<span class="prices-starter-discount active">Prices with discount</span>
<label id="pricesSwitcher" class="switch"><input type="checkbox" checked>
<span class="slider round"></span></label>
<span class="prices-starter-discount-none">Prices without discount</span>
</p>

我做错了什么？
弄明白了

document.getElementById('prices-switcher').onclick = function() {
    if (pricesSetToDiscounted == true) {
        pricesShowNormal();
    } else {
        pricesShowDiscounted();
    }
    return false;
}

在JSFIDLE、我的服务器和客户机的服务器上都能很好地工作：）
我不太确定您想要实现什么，但对我来说，您的代码是有效的。我已经做了一个快速操作。它不能同时执行
if..else
的两个分支。很可能再次触发您的单击事件@Nerdkowski-它在JSFIDLE上工作，在live server上不。。。
if..else
运行时不查看条件：(
window.pricesSetToDiscounted = true;
// I'm setting the global var to true, since from the backend side I'm showing the client the discounted prices
as he load's the website
window.prices_to_be_calculated = document.querySelectorAll(".price-to-add-discount");
// selecting all the elements with prices to work with

var btn = document.getElementById('pricesSwitcher'); // my simple button ID

btn.addEventListener('click', function() {
    if(typeof pricesSetToDiscounted != 'undefined' && pricesSetToDiscounted==true) {
       pricesShowNormal();
   }
    else if(typeof pricesSetToDiscounted != 'undefined' && pricesSetToDiscounted==false) {
        pricesShowDiscounted();
    }
}, false);

function pricesShowDiscounted() {
    var i;
    for (i = 0; i < prices_to_be_calculated.length; i++) {
        var discountedPrice = prices_to_be_calculated[i].dataset.discountedprice;
        prices_to_be_calculated[i].innerHTML = discountedPrice;     }
    pricesSetToDiscounted = true;
    console.log("pricesSetToDiscounted has value: "+pricesSetToDiscounted);
};

function pricesShowNormal() {
    var y;
    for (y = 0; y < prices_to_be_calculated.length; y++) {
        var normalPrice = prices_to_be_calculated[y].dataset.normalprice;
        prices_to_be_calculated[y].innerHTML = normalPrice;
    }
    pricesSetToDiscounted = false;
    console.log("pricesSetToDiscounted has value: "+pricesSetToDiscounted);
};

document.getElementById('prices-switcher').onclick = function() {
    if (pricesSetToDiscounted == true) {
        pricesShowNormal();
    } else {
        pricesShowDiscounted();
    }
    return false;
}