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<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <title>NgOne</title>
  <!-- <base href="/"> -->
  <!--  <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">-->
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script type="text/javascript" src="//staging-teach.cdn.ireadabc.com/h5template/h5-static-lib/js/air.js"></script>

  <style>
    .border {
      border-radius: 20px;
      border-style: dashed;
      padding: 20px;
      margin: 20px;
      width: 800px;
      border-radius: 20px;
      border-width: 2px;
      border-color: #000000;
    }

    .error {
      border-color: red;
    }

    .right {
      border-color: rgb(50, 255, 50);
    }

    .normal {
      border-color: black;
    }
  </style>

  <script>
    let saveDataStr = '';
    function loadData() {
      window.courseware.getData((data, aspect) => {
        const textarea = document.getElementById('saveDataTextarea');
        textarea.value = JSON.stringify(data);
        saveDataStr = textarea.value.trim();
      });
    }

    function saveData() {
      const textarea = document.getElementById('saveDataTextarea');
      const textareaStr = textarea.value;
      if (textareaStr.trim() == saveDataStr.trim()) {
        textarea.className = "normal";
        return;
      }

      try {
        const data = JSON.parse(textareaStr);
        window.courseware.setData(data);
        saveDataStr = textarea.value.trim();
        textarea.className = "right";
      } catch (e) {
        textarea.className = "error";
        console.error(e);
      }
    }
  </script>
</head>

<body onload="loadData();" style="background-color: white;">
  <div class="border">
    保存的数据:
    <textarea class="normal" style="width: 100%; height: 300px;" id="saveDataTextarea" onBlur="saveData();"></textarea>
  </div>
</body>

</html>