props: {
  urlList: {
   type: Array,
   default: () => []
  },
  zIndex: {
   type: Number,
   default: 2000
  },
  onSwitch: {
   type: Function,
   default: () => {}
  },
  onClose: {
   type: Function,
   default: () => {}
  }
 }

<template>
  <div>
    <el-button @click="onPreview">预览</el-button>
    <el-image-viewer 
           v-if="showViewer" 
           :on-close="closeViewer" 
           :url-list="[url]" />
  </div>
</template>
<script>
  // 导入组件
  import ElImageViewer from 'element-ui/packages/image/src/image-viewer'
  
  export default {
   name: 'Index',
   components: { ElImageViewer },
   data() {
    return {
     showViewer: false, // 显示查看器
     url:'https://cube.elemecdn.com/6/94/4d3ea53c084bad6931a56d5158a48jpeg.jpeg'
    }
   },
   methods: {
    onPreview() {
     this.showViewer = true
    },
    // 关闭查看器
    closeViewer() {
     this.showViewer = false
    }
   }
</script>