nuxt.js引入vue-awesome-swiper后，控制台报错window is not defined

###原因：
Nuxt在服务端渲染时找不到window

###查询官网文档：

###解决办法：

在nuxt的plugins目录下新建vue-awesome-swiper.js文件，代码如下：

import Vue from "vue";
import "swiper/dist/css/swiper.css";
if (process.browser) {
  const VueAwesomeSwiper = require("vue-awesome-swiper/dist/ssr");
  Vue.use(VueAwesomeSwiper);
}

修改nuxt.config.js 的plugins配置：

在nuxt.config.js的plugins里加入：

  {
      src: "@/plugins/vue-awesome-swiper",
      ssr: false
  }

IndexBanner.vue的代码为：

  <div v-swiper:mySwiper="swiperOption" class="swiper">
    <div class="swiper-wrapper">
      <div class="swiper-slide">1</div>
      <div class="swiper-slide">2</div>
    </div>
    <div class="swiper-pagination"></div>
   </div>