Question

我有一个网页，其中我使用css淡入淡出动画在两个背景图像之间淡入淡出。现在，我需要在两个图像上方添加相同的内容（徽标和按钮）。但是，此内容仅对第一个图像可见，而对第二个图像不可见。这是我的代码：

index.html

Error:Error in 1:nrow(x.2) : argument of length 0
Error:Calls: source ... <Anonymous> -> combined_rowdiffs -> rowdiff -> [ -> [.data.frame

style.css

background-image:url('../images/bg.png');
background-repeat:no-repeat;
background-size:contain;
background-position:center;

我已经筋疲力尽了。新增功能，请帮忙。

Answer 1

您要去的地方

<!DOCTYPE html>
<html lang="en">
<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>
    <style>
        .img1 {
            background: #e12;
            position: absolute;
            top: 0;
            left: 0;

        }
        .img2:hover {
            opacity: 0;
            transition: .5s;
        }
        .img2 {
            background: #312;
            position: absolute;
            top: 0;
            left: 0;
            transition: .5s;
        }
        .img1, .img2 { /* other - for demo */
            color: white;
            width: 100px;
            height: 100px;
            width: 100px;
            height: 100px;
        }
    </style>
</head>
<body>
    <div class="img1"></div>
    <div class="img2">Hello World</div>
</body>
</html>

将背景更改为图像，或者如果要使用img标签，请将每个img标签放在div中

Answer 2

这里有一个可行的示例，也许可以用它来修改您的代码；

@keyframes cf3FadeInOut {
  0% {
    opacity: 1;
  }
  45% {
    opacity: 1;
  }
  55% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

.img-container,
.bg-img-1,
.bg-img-2,
.content {
  height: 100vh;
  width: 100vw;
}

.img-container {
  position: relative;
}

.bg-img-1 {
  background-image: url('https://images.pexels.com/photos/1509428/pexels-photo-1509428.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940');
  background-size: cover;
  position: absolute;
}

.bg-img-2 {
  background-image: url('https://images.pexels.com/photos/886465/pexels-photo-886465.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940');
  position: absolute;
    background-size: cover;
  animation-name: cf3FadeInOut;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-duration: 3s;
  animation-direction: alternate;
}

.content {
  background-color: rgba(0,0,0,0.5);
  color: #fff;
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
}

<div class="img-container">
  <div class="bg-img-1"></div>
  <div class="bg-img-2"></div>
  <div class="content">
    <div>
      hello <button>world</button>
    </div>
  </div>
<div>

如何在多个图像上添加内容？

2 个答案: