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Vue - 无法在promise中设置undefined的属性

所以我有以下Vue文件:

<template>

  <li class="notifications new">
      <a href="" data-toggle="dropdown"> <i class="fa fa-bell-o"></i> <sup>
          <span class="counter">0</span>
          </sup>
       </a>
       <div class="dropdown-menu notifications-dropdown-menu animated flipInX">
            <ul v-for="notification in notifications" @click="" class="notifications-container">
              <li>
                <div class="img-col">
                  <div class="img" style="background-image: url('assets/faces/3.jpg')"></div>
                </div>
              </li>
            </ul>
        </div>
  </li>

</template>

<script>
export default {

    data: function() {
        return {
          notifications: [],
          message: "",
        }
    },

    methods: {

        loadData: function() {
            Vue.http.get('/notifications').then(function(response) {

                console.log(response.data);
                //this.notifications = response.data;
                //this.notifications.push(response.data);

                this.message = "This is a message";

                console.log(this.message);
            });

        },
    },

    mounted() {
        this.loadData(); …
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javascript vue.js

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