Vue.js v-bind:value不显示值

The v-bind:value"email" isn't displaying mike@example.com in the input box?

new Vue({
  el: '#app',
  data: {
    email: 'mike@example.com',
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <button type="submit" v-bind:value="email" class="btn btn-primary">Submit</button>
</div>
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