Lazy Loading
描述 (Description)
延迟加载，当用于大尺寸多媒体文件时，需要花费时间来加载诸如图片，视频等。
例子 (Example)
以下示例演示了延迟加载的使用，它通过触发Framework7中的“lazy”事件来加载图像 -
<!DOCTYPE html>
<html>
<head>
<meta name = "viewport" content = "width = device-width, initial-scale = 1,
maximum-scale = 1, minimum-scale = 1, user-scalable = no, minimal-ui" />
<meta name = "apple-mobile-web-app-capable" content = "yes" />
<meta name = "apple-mobile-web-app-status-bar-style" content = "black" />
<title>Lazy Loading</title>
<link rel = "stylesheet"
href = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/css/framework7.ios.min.css" />
<link rel = "stylesheet"
href = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/css/framework7.ios.colors.min.css" />
</head>
<body>
<div class = "views">
<div class = "view view-main">
<div class = "pages">
<div data-page = "home" class = "page navbar-fixed">
<div class = "navbar">
<div class = "navbar-inner">
<div class = "left"> </div>
<div class = "center">Lazy Loading</div>
<div class = "right"> </div>
</div>
</div>
<div class = "page-content">
<div class = "swiper-container">
<div class = "swiper-wrapper">
<div class = "swiper-slide">
<img data-src = "http://lorempixel.com/1600/1200/nature/1" class = "swiper-lazy">
<div class = "preloader"></div>
</div>
<div class = "swiper-slide">
<img data-src = "http://lorempixel.com/1600/1200/nature/2" class = "swiper-lazy">
<div class = "preloader"></div>
</div>
<div class = "swiper-slide">
<img data-src = "http://lorempixel.com/1600/1200/nature/3" class = "swiper-lazy">
<div class = "preloader"></div>
</div>
<div class = "swiper-slide">
<img data-src = "http://lorempixel.com/1600/1200/nature/4" class = "swiper-lazy">
<div class = "preloader"></div>
</div>
<div class = "swiper-slide">
<img data-src = "http://lorempixel.com/1600/1200/nature/5" class = "swiper-lazy">
<div class = "preloader"></div>
</div>
</div>
<div class = "swiper-pagination color-white"></div>
</div>
</div>
</div>
</div>
</div>
</div>
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/js/framework7.min.js"></script>
<style>
.swiper-container {
height:100%;
}
.swiper-slide {
background:#000;
position:relative;
height:100%;
}
.swiper-slide img {
position:absolute;
left:50%;
top:50%;
max-width:100%;
max-height:100%;
width:auto;
height:auto;
-webkit-transform:translate(-50%,-50%);
transform:translate(-50%,-50%);
}
</style>
<script>
var myApp = new Framework7();
var mySwiper = new Swiper('.swiper-container', {
preloadImages: false,
lazyLoading: true,
pagination: '.swiper-pagination'
})
</script>
</body>
</html>
输出 (Output)
让我们执行以下步骤，看看上面给出的代码是如何工作的 -
将上面给出的HTML代码保存为服务器根文件夹中的lazy_loading.html文件。
以http://localhost/lazy_loading.html打开此HTML文件，并显示如下输出。
该示例演示了使用大尺寸多媒体文件（如图像，视频等）时的延迟加载。
