@2的版本支持umd，但是@1的版本好像没看见支持umd的

感谢你的反馈，我已在 ~~1.0.7~~ 1.0.8 版本中进行了支持

由于1.0.7 存在bug，在1.0.8中进行了修复

jsdelivr - vue-img-viewr@1.0.8 中可以查看CDN文件

同时引入js和css文件，~~lib/vue-img-viewr.umd.js~~ lib/vue-img-viewr.min.js styles/index.min.css
不要使用lib/vue-img-viewr.umd.min.js

~~以下是demo~~
以下是基于 1.0.8 的 demo

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>vue-img-viewr demo</title>
  <!-- vue 2 cdn -->
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.9/dist/vue.min.js"></script>
  <!-- vue-img-viewr cdn - js -->
  <script src="https://cdn.jsdelivr.net/npm/vue-img-viewr@1.0.8/lib/vue-img-viewr.min.js"></script>
  <!-- vue-img-viewr cdn - css -->
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vue-img-viewr@1.0.8/styles/index.min.css">
  <style>
    .imgs {
      display: flex;
    }
    .img {
      width: 150px;
      height: 100px;
      border: 1px solid #EEE;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 20px;
    }
    .img img {
      max-width: 100%;
      max-height: 100%;
      cursor: pointer;
    }
  </style>
</head>
<body>
  <div id="app">
    <div>
      <h3>通过组件方式</h3>
      <div class="imgs">
        <div v-for="(url, i) in urls" class="img" :key="`c_${i}`" @click="() => showImagesByComponent(i)">
          <img :src="url" />
        </div>
      </div>
      <img-viewr :visible="visible" :urls="urls" :initial-index="index" :on-close="closeHandle" :on-switch="changeHandle" :on-show="showHandle" />
    </div>
    <div>
      <h3>通过js方法调用</h3>
      <div class="imgs">
        <div v-for="(url, i) in urls" class="img" :key="i" @click="() => showImagesByJs(i)">
          <img :src="url" />
        </div>
      </div>
    </div>
  </div>
</body>
<script>
  const { showImages, ImgViewr } = window['vue-img-viewr']
  const images = [
    'https://s.gravatar.com/avatar/221f86a573320174bad7a62886a6d4b4?size=100&default=retro',
    'https://s.gravatar.com/avatar/221f86a573320174bad7a62886a6d4b4',
    'https://static.npmjs.com/attachments/ck3uwf5d872zb8874c3ayi1pj-icon-pro-wombat-3x.png'
  ]
  new Vue({
    el: '#app',
    components: { 'img-viewr': ImgViewr },
    data() {
      return {
        urls: images,
        index: 0,
        visible: false
      }
    },
    methods: {
      showImagesByComponent (i) {
        this.visible = true
        this.index = i
      },
      showImagesByJs (i) {
        showImages({
          urls: this.urls,
          index: i,
          onSwitch: this.changeHandle,
          onClose: () => {
            console.log('close with js')
            return true
          },
          onShow: this.showHandle
        })
      },
      changeHandle (i) {
        console.log(`current image index: ${i}`)
      },
      showHandle (isShow) {
        console.log(`component is show: ${isShow}`)
      },
      closeHandle () {
        console.log('close component')
        this.visible = false
      }
    }
  })
</script>
</html>

jekorx / vue-img-viewr

@2的版本支持umd，但是@1的版本好像没看见支持umd的 #4