vue.js - 在keyup Vuejs 2上获取输入值

Question

我正在尝试使用 Vuejs 2 在 keyup 上获取输入值，但总是得到像数据一样的空结果。请看下面的代码。

HTML:

<input type="email" @keyup="this.$data.email= $event.target.value" class="form-control" id="email" placeholder="Username (your work email)">
<button type="button" class="btn btn-primary btn-block inactive" @click="submit">Log in</button>

脚本:

data () {
  return {
    email: '',
  }
},
methods: {
  submit () {
    alert(this.$data.email)
  }
}

Answer 1

您需要引用email(不是this.$data.email):

<input type="email" @keyup="email = $event.target.value" class="form-control" id="email" placeholder="Username (your work email)">

---

而且，为什么不使用 v-model 将 email 绑定(bind)到输入？

new Vue({
  el: '#app',
  data () {
    return {
      email: '',
    }
  },
  methods: {
    submit () {
      alert(this.email)
    }
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.min.js"></script>
<div id="app">
  <input type="email" v-model="email" class="form-control" id="email" placeholder="Username (your work email)">
  <button type="button" class="btn btn-primary btn-block inactive" @click="submit">Log in</button>
</div>