l-hammer/YDTemplate

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src/JSAPI/superSimpleTwoWay.html

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

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>

<body>
  <input type="text" placeholder="enter……">
  <span id="app"></span>

  <script>
    const vetar = {};
    Object.defineProperty(vetar, 'model', {
      set(val) {
        document.querySelector('input[type=text]').value = val;
        document.querySelector('#app').innerHTML = val;
      },
    });

    document.addEventListener('keyup', (e) => {
      vetar.model = e.target.value;
    });
  </script>
</body>

</html>