Question

我是空气控制台的新手，我只是学习它，所以也许这是常见的事情。我在screen.html上有这个：

<html>
  <head>
    <script type="text/javascript" src="https://www.airconsole.com/api/airconsole-1.7.0.js"></script>
    <script type="text/javascript">
    var air_console = new AirConsole();

    // Listen for messages from other devices
    air_console.onMessage = function(from, data) {

      // We receive a message -> Send message back to the device
      air_console.message(from, "Full of pixels!");

      // Show message on device screen
      var info = document.createElement('DIV');
      info.innerHTML = data;
      document.body.appendChild(info);
    };
    </script>
    <style type="text/css">
      color: white;
    </style>
  </head>
  <body>

  </body>
</html>

我在controller.html中有这个

<html>
<head>
  <script type="text/javascript" src="https://www.airconsole.com/api/airconsole-1.7.0.js"></script>
  <script type="text/javascript">
    var air_console = new AirConsole();

    // Send a message to the screen
    air_console.message(AirConsole.SCREEN, "How are you?");

    // Listen for messages
    air_console.onMessage = function(from, data) {

      // Show message on device screen
      var info = document.createElement('DIV');
      info.innerHTML = data;
      document.body.appendChild(info);
    };
  </script>
    <style type="text/css">
      color: white;
    </style>
</head>
<body>

</body>
</html>

我在这两个方面都遇到了这个错误：

Uncaught TypeError: Cannot read property 'undefined' of undefined
    at AirConsole.onPostMessage_ (airconsole-1.7.0.js:1012)
    at airconsole-1.7.0.js:927

当然屏幕上什么都没有。这里我的错误是什么，我该如何解决？

Answer 1

在发送消息之前，您需要等待 onReady 事件：

<html>
<head>
  <script type="text/javascript" src="https://www.airconsole.com/api/airconsole-1.7.0.js"></script>
  <script type="text/javascript">
    var air_console = new AirConsole();

    air_console.onReady = function() {
      // Send a message to the screen
      air_console.message(AirConsole.SCREEN, "How are you?");
    }

    // Listen for messages
    air_console.onMessage = function(from, data) {

      // Show message on device screen
      var info = document.createElement('DIV');
      info.innerHTML = data;
      document.body.appendChild(info);
    };
  </script>
    <style type="text/css">
      color: white;
    </style>
</head>
<body>

</body>
</html>

为什么我在airconsole-1.4.0.js：669得到“Uncaught TypeError”？

1 个答案: