javascript - 如何让按钮更改图像？

Question

我制作了一个内部有图像的 div，然后制作了一个按钮。我希望它是这样的，当我按下按钮时，它会在我要添加的多个图像之间切换。

这是按钮和图像的 HTML:

#gallery {
  width: 800px;
  height: 450px;
  position: absolute;
  left: 310px;
  top: 180px;
  padding: 0;
  margin: 0;
  z-index: -1;
}

#UCL {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 5px;
}

button {
  width: 100px;
  height: 60px;
  font-family: "Economica";
  font-size: 18px;
  background-color: #383838;
  color: white;
  font-weight: bold;
  font-size: 23px;
  border: 0;
  margin-left: 670px;
  margin-top: 110px;
  border-radius: 12px;
  position: absolute;
  opacity: 1;
}

button:hover {
  background-color: white;
  transition: ease 0.7s;
  color: black;
}

<button onclick="myFunction()"> 
  Next
</button>
<div id=gallery>
  <img id="UCL" src="http://byuinsider.com/wp-
    content/uploads/2015/09/Champions-League-Stadium-Football-Wallpapers-
    HD.jpg" alt="Stadium">
</div>

Answer 1

您可以使用包含图像 url 的数组来完成此操作，如下所示:

var images=['http://placeskull.com/300x300','http://placeskull.com/400x400','http://placeskull.com/500x500'];
var idx=0; // we're at the first image so, 0
function myFunction() {
  $('#UCL').attr('src',images[idx]);
  idx=(idx+1)%(images.length); // to avoid the index getting bigger than the number of images, we use the modulo operator % to make it circular, 0 1 2 0 1 2 0 1 2 ...
}
myFunction();
window.setInterval(function(){
  myFunction();
}, 2000); // 2000ms, change to whatever timing you want

#gallery {
  width: 800px;
  height: 450px;
  position: absolute;
  left: 310px;
  top: 180px;
  padding: 0;
  margin: 0;
  z-index: -1;
}

#UCL {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 5px;
}

button {
  width: 100px;
  height: 60px;
  font-family: "Economica";
  font-size: 18px;
  background-color: #383838;
  color: white;
  font-weight: bold;
  font-size: 23px;
  border: 0;
  margin-left: 670px;
  margin-top: 110px;
  border-radius: 12px;
  position: absolute;
  opacity: 1;
}

button:hover {
  background-color: white;
  transition: ease 0.7s;
  color: black;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button onclick="myFunction()" id="nextImage"> 
  Next
</button>
<div id=gallery>
  <img id="UCL" src="" alt="Puppy">
</div>