Question

我正在尝试更改mouseclick上的4张背景图像。

此刻，同一张图像在屏幕上出现4次（每个角1个）。我只希望在整个屏幕上显示一个图像，而当我单击当前图像时，其他图像替换它；再次单击时，依此类推。我不确定目前我的代码有什么问题。

HTML：

<!DOCTYPE html>
<html lang="fr" dir="ltr">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">

  <title> CODE </title>
  <link rel="stylesheet" type="text/css" href="css/style.css"/>
  <script src="js/jquery.js"></script>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

  <script src="js/sketch.js"></script>

</head>

<body>

<div id="body" class="imageOne"></div>

</body>

</html>

JS：

var bodyObj,
  className,
  index;

bodyObj = document.getElementById('body');
index = 1;
className = [
  'imageOne',
  'imageTwo'
];

function updateIndex() {
  if (index === 0) {
    index = 1;
  } else {
    index = 0;
  }
}

bodyObj.onclick = function(e) {
  e.currentTarget.className = className[index];
  updateIndex();
}

CSS：

html, body, #body {
    height: 100%;
    width: 100%;
}

#body.imageOne {
    background-image: url("img1.png");
}

#body.imageTwo {
    background-image: url("img2.png");
}

#body.imageTwo {
    background-image: url("img3.png");
}

#body.imageTwo {
    background-image: url("img4.png");
}

Answer 1

与其将类用于每个图像，不如将它们存储在一个数组中，然后以编程方式对其进行更改，这将是一个很好的选择。请在下面找到代码段。

let imgList = [
  'https://dummyimage.com/200x200/000/fff&text=image+1',
  'https://dummyimage.com/200x200/000/fff&text=image+2', 'https://dummyimage.com/200x200/000/fff&text=image+3', 'https://dummyimage.com/200x200/000/fff&text=image+4'
];

let currentIndex = 0;

function changeImg() {
  $('#body').css('backgroundImage', `url(${imgList[currentIndex]})`);
  currentIndex++;
  if (currentIndex == imgList.length) currentIndex = 0;
}

changeImg();

$('#body').on('click', changeImg);

#body {
  width: 200px;
  height: 200px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<div id="body" class="imageOne"></div>

Answer 2

这是另一种方式（像以前一样使用类）：

var bodyObj   = document.getElementById('body'),
    index     = 0,
    className = [
      'imageOne',
      'imageTwo',
      'imageThree',
      'imageFour'
    ];

bodyObj.onclick = function(e) {
  index = (index + 1) % className.length;
  e.currentTarget.className = className[index];
}

html,body,#body { margin: 0; height: 100%; width: 100%; }

#body { background-position: center; background-size: cover; }

#body.imageOne { background-image: url("https://picsum.photos/id/9/536/354"); }
#body.imageTwo { background-image: url("https://picsum.photos/id/3/536/354"); }
#body.imageThree { background-image: url("https://picsum.photos/id/1/536/354"); }
#body.imageFour { background-image: url("https://picsum.photos/id/2/536/354"); }

<div id="body" class="imageOne"></div>

Answer 3

我尝试了这个效果很好的东西！

var index = 0;
var className = ['imageOne',
'imageTwo',
'imageThree',
'imageFour',
'imageFive'];

$(document).ready(function() {
$("#main").on("click", function() {
index = (index + 1) % className.length;
$(this).attr('class', className[index]);
});
});

单击更改背景图像

3 个答案: