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当浏览器开始离线工作时，在html中执行脚本？

当网络浏览器开始离线工作时，onoffline 属性就会触发。您可以尝试运行以下代码来实现onoffline 属性 -

示例

<!DOCTYPE html>
<html>
   <body ononline = "onlineFunc()" onoffline = "offlineFunc()">
      <script>
         function onlineFunc() {
            alert ("Working online!");
         }
         function offlineFunc() {
            alert ("Workinf offline!");
         }
      </script>
      <p>Got o the web browser menu bar and click the File menu. Select "Work Offline" and toggle between online and offline.</p>
   </body>
</html>