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v_bind.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>bind</title>
    <link rel="stylesheet" href="v_bind.css">
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <p>{{ foo }}</p>
        <!-- 这里的 `foo` 不会更新！ -->
        <button v-on:click="foo = 'what' ">Change it</button>
      </div>
      <script>
        var obj = {
            foo: '???'
        }
        //Object.freeze(obj)冻结数据
        new Vue({
            el: '#app',
            data: obj
          })
        </script>
</body>
</html>