javascript - 如何在图像幻灯片上放置黑色叠加层

标签 javascript html css

我有一个用 js 制作的幻灯片(我没有添加)，我想在图像上做一个黑色覆盖，我尝试了很多方法，但没有任何效果。这是我的代码，任何人都可以帮助我。 javascript 只是将图像附加到每个 span 元素。我想要图像上方和文本下方的黑色透明覆盖层。

<!DOCTYPE html>
<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Fullscreen Background Image Slideshow with
        CSS3 - A Css-only fullscreen background image slideshow" />
    <meta name="keywords" content="css3, css-only, fullscreen, background,
        slideshow, images, content" />
    <meta name="author" content="Codrops" />
    <link rel="shortcut icon" href="../favicon.ico">
    <link rel="stylesheet" type="text/css" href="css/demo.css" />
    <link rel="stylesheet" type="text/css" href="css/style4.css" />
    <script type="text/javascript" src="js/modernizr.custom.86080.js"></script>
</head>
<body id="page">
    <ul class="cb-slideshow">
        <li><span></span><div><h3>Picture perfect Designs</h3></div></li>
        <li><span>Image 02</span><div><h3>Perfect blend of Logic and creativity</h3></div></li>
        <li><span>Image 03</span><div><h3>Have an idea? contact us</h3></div></li>
        <li><span>Image 04</span><div><h3>Need a website for your buisness</h3></div></li>
        <li><span>Image 05</span><div><h3>qui·e·tude</h3></div></li>
        <li><span>Image 06</span><div><h3>re·lax·a·tion</h3></div></li>
    </ul>
    <div class="container">
        <!-- Codrops top bar -->
        <div class="codrops-top">

            <span class="right">

            </span>
            <div class="clr"></div>
        </div><!--/ Codrops top bar -->

        </div>
    </body>
</html>


<style>
.cb-slideshow, .cb-slideshow:after {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0px;
    left: 0px;
    z-index: 0;
}

.cb-slideshow:after {
    content: '';
    background: transparent url(../images/pattern.png) repeat top left;
}

.cb-slideshow li span {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 0px;
    color: transparent;
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: none;
    opacity: 0;
    z-index: 0;
    -webkit-backface-visibility: hidden;
    -webkit-animation: imageAnimation 36s linear infinite 0s;
    -moz-animation: imageAnimation 36s linear infinite 0s;
    -o-animation: imageAnimation 36s linear infinite 0s;
    -ms-animation: imageAnimation 36s linear infinite 0s;
    animation: imageAnimation 36s linear infinite 0s;
}

.cb-slideshow li div {
    z-index: 1000;
    position: absolute;
    bottom: 30px;
    left: 0px;
    width: 100%;
    text-align: center;
    opacity: 0;
    -webkit-animation: titleAnimation 36s linear infinite 0s;
    -moz-animation: titleAnimation 36s linear infinite 0s;
    -o-animation: titleAnimation 36s linear infinite 0s;
    -ms-animation: titleAnimation 36s linear infinite 0s;
    animation: titleAnimation 36s linear infinite 0s;
}

.cb-slideshow li div h3 {
    font-family: 'BebasNeueRegular', 'Arial Narrow', Arial, sans-serif;
    font-size: 240px;
    padding: 0;
    line-height: 200px;
    color: white;
}

.cb-slideshow li:nth-child(1) span {
    background-image: url(../images/1.jpg);
    opacity: 0.9;
}

.cb-slideshow li:nth-child(2) span {
    background-image: url(../images/2.jpg);
    -webkit-animation-delay: 6s;
    -moz-animation-delay: 6s;
    -o-animation-delay: 6s;
    -ms-animation-delay: 6s;
    animation-delay: 6s;
}

.cb-slideshow li:nth-child(3) span {
    background-image: url(../images/3.jpg);
    -webkit-animation-delay: 12s;
    -moz-animation-delay: 12s;
    -o-animation-delay: 12s;
    -ms-animation-delay: 12s;
    animation-delay: 12s;
}

.cb-slideshow li:nth-child(4) span {
    background-image: url(../images/4.jpg);
    -webkit-animation-delay: 18s;
    -moz-animation-delay: 18s;
    -o-animation-delay: 18s;
    -ms-animation-delay: 18s;
    animation-delay: 18s;
}

.cb-slideshow li:nth-child(5) span {
    background-image: url(../images/5.jpg);
    -webkit-animation-delay: 24s;
    -moz-animation-delay: 24s;
    -o-animation-delay: 24s;
    -ms-animation-delay: 24s;
    animation-delay: 24s;
}

.cb-slideshow li:nth-child(6) span {
    background-image: url(../images/6.jpg);
    -webkit-animation-delay: 30s;
    -moz-animation-delay: 30s;
    -o-animation-delay: 30s;
    -ms-animation-delay: 30s;
    animation-delay: 30s;
}

.cb-slideshow li:nth-child(2) div {
    -webkit-animation-delay: 6s;
    -moz-animation-delay: 6s;
    -o-animation-delay: 6s;
    -ms-animation-delay: 6s;
    animation-delay: 6s;
}

.cb-slideshow li:nth-child(3) div {
    -webkit-animation-delay: 12s;
    -moz-animation-delay: 12s;
    -o-animation-delay: 12s;
    -ms-animation-delay: 12s;
    animation-delay: 12s;
}

.cb-slideshow li:nth-child(4) div {
    -webkit-animation-delay: 18s;
    -moz-animation-delay: 18s;
    -o-animation-delay: 18s;
    -ms-animation-delay: 18s;
    animation-delay: 18s;
}

.cb-slideshow li:nth-child(5) div {
    -webkit-animation-delay: 24s;
    -moz-animation-delay: 24s;
    -o-animation-delay: 24s;
    -ms-animation-delay: 24s;
    animation-delay: 24s;
}

.cb-slideshow li:nth-child(6) div {
    -webkit-animation-delay: 30s;
    -moz-animation-delay: 30s;
    -o-animation-delay: 30s;
    -ms-animation-delay: 30s;
    animation-delay: 30s;
}

/* Animation for the slideshow images */

@-webkit-keyframes imageAnimation {
    0% {
        opacity: 0;
        -webkit-animation-timing-function: ease-in;
    }
    8% {
        opacity: 1;
        -webkit-transform: scale(1.05);
        -webkit-animation-timing-function: ease-out;
    }
    17% {
        opacity: 1;
        -webkit-transform: scale(1.1);
    }
    25% {
        opacity: 0;
        -webkit-transform: scale(1.1);
    }
    100% {
        opacity: 0
    }
}

@-moz-keyframes imageAnimation {
    0% {
        opacity: 0;
        -moz-animation-timing-function: ease-in;
    }
    8% {
        opacity: 1;
        -moz-transform: scale(1.05);
        -moz-animation-timing-function: ease-out;
    }
    17% {
        opacity: 1;
        -moz-transform: scale(1.1);
    }
    25% {
        opacity: 0;
        -moz-transform: scale(1.1);
    }
    100% {
        opacity: 0
    }
}

@-o-keyframes imageAnimation {
    0% {
        opacity: 0;
        -o-animation-timing-function: ease-in;
    }
    8% {
        opacity: 1;
        -o-transform: scale(1.05);
        -o-animation-timing-function: ease-out;
    }
    17% {
        opacity: 1;
        -o-transform: scale(1.1);
    }
    25% {
        opacity: 0;
        -o-transform: scale(1.1);
    }
    100% {
        opacity: 0
    }
}

@-ms-keyframes imageAnimation {
    0% {
        opacity: 0;
        -ms-animation-timing-function: ease-in;
    }
    8% {
        opacity: 1;
        -ms-transform: scale(1.05);
        -ms-animation-timing-function: ease-out;
    }
    17% {
        opacity: 1;
        -ms-transform: scale(1.1);
    }
    25% {
        opacity: 0;
        -ms-transform: scale(1.1);
    }
    100% {
        opacity: 0
    }
}

@keyframes imageAnimation {
    0% {
        opacity: 0;
        animation-timing-function: ease-in;
    }
    8% {
        opacity: 1;
        transform: scale(1.05);
        animation-timing-function: ease-out;
    }
    17% {
        opacity: 1;
        transform: scale(1.1);
    }
    25% {
        opacity: 0;
        transform: scale(1.1);
    }
    100% {
        opacity: 0
    }
}

/* Animation for the title */

@-webkit-keyframes titleAnimation {
    0% {
        opacity: 0;
        -webkit-transform: translateY(200px);
    }
    8% {
        opacity: 1;
        -webkit-transform: translateY(0px);
    }
    17% {
        opacity: 1;
        -webkit-transform: scale(1);
    }
    19% {
        opacity: 0
    }
    25% {
        opacity: 0;
        -webkit-transform: scale(10);
    }
    100% {
        opacity: 0
    }
}

@-moz-keyframes titleAnimation {
    0% {
        opacity: 0;
        -moz-transform: translateY(200px);
    }
    8% {
        opacity: 1;
        -moz-transform: translateY(0px);
    }
    17% {
        opacity: 1;
        -moz-transform: scale(1);
    }
    19% {
        opacity: 0
    }
    25% {
        opacity: 0;
        -moz-transform: scale(10);
    }
    100% {
        opacity: 0
    }
}

@-o-keyframes titleAnimation {
    0% {
        opacity: 0;
        -o-transform: translateY(200px);
    }
    8% {
        opacity: 1;
        -o-transform: translateY(0px);
    }
    17% {
        opacity: 1;
        -o-transform: scale(1);
    }
    19% {
        opacity: 0
    }
    25% {
        opacity: 0;
        -o-transform: scale(10);
    }
    100% {
        opacity: 0
    }
}

@-ms-keyframes titleAnimation {
    0% {
        opacity: 0;
        -ms-transform: translateY(200px);
    }
    8% {
        opacity: 1;
        -ms-transform: translateY(0px);
    }
    17% {
        opacity: 1;
        -ms-transform: scale(1);
    }
    19% {
        opacity: 0
    }
    25% {
        opacity: 0;
        -webkit-transform: scale(10);
    }
    100% {
        opacity: 0
    }
}

@keyframes titleAnimation {
    0% {
        opacity: 0;
        transform: translateY(200px);
    }
    8% {
        opacity: 1;
        transform: translateY(0px);
    }
    17% {
        opacity: 1;
        transform: scale(1);
    }
    19% {
        opacity: 0
    }
    25% {
        opacity: 0;
        transform: scale(10);
    }
    100% {
        opacity: 0
    }
}

/* Show at least something when animations not supported */

.no-cssanimations .cb-slideshow li span {
    opacity: 1;
}

@media screen and (max-width: 1140px) {
    .cb-slideshow li div h3 {
        font-size: 100px
    }
}

@media screen and (max-width: 600px) {
    /*  .cb-slideshow li div h3 { font-size: 50px }*/
    .cb-slideshow li div h3 {
        font-size: 30px
    }
}
</style>

最佳答案

我认为您不希望叠加层高于所有内容手段 你想要一个图像，一些文本内容必须在它上面，并且在这两者之间你想要一个叠加层。如果是这种情况，那么您必须更改 li 的内部结构。

  • 首先将带有文本内容的div。 (在您的情况下，您使用的是标题标签)
  • 其次放置带有类叠加层和样式背景色的新 div 覆盖类为 rgba(0,0,0,0.7)
  • 最后，放上图片标签。

此解决方案的问题是您必须创建与图像数量一样多的叠加 div。

但是如果你想覆盖一切 然后，您只能在 ul 标签之前添加新的 div 具有相同的 css 属性。

0.7 是 alpha 值，您可以在 0-1 之间更改它以适应不同的叠加暗度。

关于javascript - 如何在图像幻灯片上放置黑色叠加层，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50552113/

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