Framework7 - 延迟加载

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描述

延迟加载在用于加载大型多媒体文件（如图片、视频等）时需要花费时间。

示例

以下示例演示了延迟加载的使用，它通过在 Framework7 中触发“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

让我们执行以下步骤来查看以上代码的工作原理：

  • 将以上 HTML 代码保存为lazy_loading.html文件，并将其放置在服务器根目录下。

  • 在浏览器中打开此 HTML 文件，例如 https://127.0.0.1/lazy_loading.html，将显示以下输出。

  • 此示例演示了在使用大型多媒体文件（如图像、视频等）时使用延迟加载。

framework7_swiper_slider.htm
打印页面
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