JS 点击事件监听器仅工作一次，并且不能与预期的 if 语句一起工作
我正在使用一个库来比较不同的照片，就像“之前和之后”之类的东西，它们显示在另一张的上面，中间有一个按钮，您可以向左或向右拖动以查看照片差异。
现在，我想做的是实现两个按钮 - 一个在图片的左侧，一个在右侧。当您单击这些按钮时，我希望照片与前两张或后两张发生变化。
我为按钮做了一个 if 语句，但它们无法正常工作，尽管我没有注意到任何明显的错误。
HTML代码
<div id="wrapper">
<div class="arrowsContainer">
<div id="leftArrow">
<p>Left</p>
</div>
</div>
<div class="cd-image-container">
<img src="" id="originalImage" alt="Original Image">
<div class="cd-resize-img">
<img src="" id="modifiedImage" alt="Modified Image">
</div>
<span class="cd-handle"></span>
</div>
<div class="arrowsContainer">
<div id="rightArrow">
<p>Right</p>
</div>
</div>
</div>
JavaScript 代码
let originalImage = document.querySelector('#originalImage');
let modifiedImage = document.querySelector('#modifiedImage');
document.querySelector('#leftArrow').addEventListener("click", function(){
if ((modifiedImage.src = "img/3.jpg") && (originalImage.src = "img/4.jpg")){
modifiedImage.src = "img/1.jpg";
originalImage.src = "img/2.jpg";
}
});
document.querySelector('#rightArrow').addEventListener('click', function(){
if ((modifiedImage.src = "img/1.jpg") && (originalImage.src = "img/2.jpg")){
modifiedImage.src = "img/3.jpg";
originalImage.src = "img/4.jpg";
}
if ((modifiedImage.src = "img/3.jpg") && (originalImage.src = "img/4.jpg")){
modifiedImage.src = "img/5.jpg";
originalImage.src = "img/6.jpg";
}
if ((modifiedImage.src = "img/5.jpg") && (originalImage.src = "img/6.jpg")){
modifiedImage.src = "img/7.jpg";
originalImage.src = "img/8.jpg";
}
});
现在，如果我打开页面，就会显示照片 1 和 2。如果我点击“右”按钮，它将显示图片 7 和 8，从那里，如果我点击“左”按钮，它将再次显示图片 1 和 2，尽管我在“左”上的条件按钮甚至不包括您在图 7 和 8 中的场景。
请帮忙，我真的不明白发生了什么
米脂2回答
-
素胚勾勒不出你
我认为您想要实现的是，当您单击按钮时right您想要显示接下来的两个图像，当您单击按钮时prev您想要显示前两个图像。如果是这种情况，那么您可以检查我的解决方案。这是js文件。let originalImage = document.querySelector("#originalImage");let modifiedImage = document.querySelector("#modifiedImage");const totalImages = 8;let currentCount = 0;document.querySelector("#leftArrow").addEventListener("click", function() { currentCount = (currentCount - 2 + totalImages) % totalImages; originalImage.src = `./img/${currentCount + 1}.jpg`; modifiedImage.src = `./img/${currentCount + 2}.jpg`;});document.querySelector("#rightArrow").addEventListener("click", function() { currentCount = (currentCount + 2) % totalImages; originalImage.src = `./img/${currentCount + 1}.jpg`; modifiedImage.src = `./img/${currentCount + 2}.jpg`;});这是.html文件<!DOCTYPE html><html> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta http-equiv="X-UA-Compatible" content="ie=edge" /> <title>Document</title> <link rel="stylesheet" href="style.css" /> </head> <body> <!-- <div class="container">Item</div> --> <div id="wrapper"> <div class="arrowsContainer"> <div id="leftArrow"> <p>Left</p> </div> </div> <div class="cd-image-container"> <img src="./img/1.jpg" id="originalImage" alt="Original Image" /> <div class="cd-resize-img"> <img src="./img/2.jpg" id="modifiedImage" alt="Modified Image" /> </div> <span class="cd-handle"></span> </div> <div class="arrowsContainer"> <div id="rightArrow"> <p>Right</p> </div> </div> </div> <script src="main.js"></script> </body></html>let originalImage = document.querySelector("#originalImage");let modifiedImage = document.querySelector("#modifiedImage");const totalImages = 8;let currentCount = 0;document.querySelector("#leftArrow").addEventListener("click", function() { currentCount = (currentCount - 2 + totalImages) % totalImages; originalImage.src = `https://i.picsum.photos/id/${currentCount + 1}/200/300.jpg`; modifiedImage.src = `https://i.picsum.photos/id/${currentCount + 2}/200/300.jpg`;});document.querySelector("#rightArrow").addEventListener("click", function() { currentCount = (currentCount + 2) % totalImages; originalImage.src = `https://i.picsum.photos/id/${currentCount + 1}/200/300.jpg`; modifiedImage.src = `https://i.picsum.photos/id/${currentCount + 2}/200/300.jpg`;});#wrapper { display: flex;}.cd-image-container { display: flex;}#leftArrow,#rightArrow { cursor: pointer;}<!DOCTYPE html><html> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta http-equiv="X-UA-Compatible" content="ie=edge" /> <title>Document</title> <link rel="stylesheet" href="style.css" /> </head> <body> <!-- <div class="container">Item</div> --> <div id="wrapper"> <div class="arrowsContainer"> <div id="leftArrow"> <p>Left</p> </div> </div> <div class="cd-image-container"> <img src="https://i.picsum.photos/id/1/200/300.jpg" id="originalImage" alt="Original Image" /> <div class="cd-resize-img"> <img src="https://i.picsum.photos/id/2/200/300.jpg" id="modifiedImage" alt="Modified Image" /> </div> <span class="cd-handle"></span> </div> <div class="arrowsContainer"> <div id="rightArrow"> <p>Right</p> </div> </div> </div> <script src="main.js"></script> </body></html> -
杨__羊羊
在 if 语句中使用 == 或 ===试一试if ((modifiedImage.src == "img/1.jpg") && (originalImage.src == "img/2.jpg")){ modifiedImage.src = "img/3.jpg"; originalImage.src = "img/4.jpg";here
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