预加载器（Preloaders）

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2023-12-01

描述 (Description)

Framework7中的预加载器由可缩放矢量图形（SVG）制成，并使用CSS动画，这使其易于调整大小。预加载器有两种颜色 -

默认为浅色背景
另一个是黑暗的背景

您可以在HTML中使用preloader类，如下所示 -

例子 (Example)

以下示例演示了Framework7中预加载器的使用 -

<!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>Panel Events</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">Framework7 Preloader</div>
                        <div class = "right"> </div>
                     </div>
                  </div>
                  <div class = "page-content">
                     <div class = "content-block row">
                        <div class = "col-25"><span class = "preloader"></span><br>Default Preloader</div>
                        <div class = "col-25 col-dark"><span class = "preloader preloader-white"></span><br>White Preloader</div>
                        <div class = "col-25"><span style = "width:42px; height:42px" class = "preloader"></span><br>Big Preloader</div>
                        <div class = "col-25 col-dark"><span style = "width:42px; height:42px" class = "preloader preloader-white"></span><br>White Preloader</div>
                     </div>
                  </div>
               </div>
            </div>
         </div>
      </div>
      <style>.col-25{padding:5px;text-align:center;}.col-dark{background:#222;}</style>
      <script type = "text/javascript" 
         src = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/js/framework7.min.js"></script>
      <script>
         var myApp = new Framework7();
      </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preloader.html文件。
以http://localhost/preloader.html打开此HTML文件，输出显示如下。
此代码显示预加载器指示器，该指示器由SVG制作并使用CSS进行动画处理。