elementUi 通过点击预览按钮实现 预览大图previewSrcList（两种方式）

第一种：（使用elementUi官网文档中的组件）一般项目中需要点击触发事件才进行查看大图，elementUi组件库中并没有写触发需要执行的代码，这里在触发的方法中加this.$refs.preview.clickHandler()触发查看大图功能

<template>
  <!-- 图片预览方法一 -->
  <div class="demo-image__preview">
    <el-button @click="onPreview">预览</el-button>
    <el-image
      style="width: 100px; height: 100px"
      ref="preview"
      :src="url"
      :preview-src-list="srcList"
    ></el-image>
  </div>
</template>

<script>
export default {
  data() {
    return {
      url: "https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg",
      srcList: [
        "https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg",
        "https://fuss10.elemecdn.com/8/27/f01c15bb73e1ef3793e64e6b7bbccjpeg.jpeg",
        "https://fuss10.elemecdn.com/1/8e/aeffeb4de74e2fde4bd74fc7b4486jpeg.jpeg",
      ],
    };
  },
  components: {},
  methods: {
    onPreview() {
      this.$refs.preview.clickHandler();
    },
  },
};
</script>

<style></style>

第二种：（ 使用el-image-viewer组件，是elementUi自带的但官网文档中可能因不兼容IE没有把它暴露出来，不需要下载包引入即可）

<template>
  <div>
    <el-button @click="onPreview">预览</el-button>
    <el-image
      style="width: 100px; height: 100px"
      ref="preview"
      :src="url"
      :preview-src-list="srcList"
    ></el-image>
    <el-image-viewer
      v-if="showViewer"
      :on-close="closeViewer"
      :url-list="srcList"
    />
  </div>
</template>

<script>
import ElImageViewer from "element-ui/packages/image/src/image-viewer";
export default {
  components: { ElImageViewer },
  data() {
    return {
      showViewer: false,
      url: "https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg",
      srcList: [
        "https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg",
        "https://fuss10.elemecdn.com/8/27/f01c15bb73e1ef3793e64e6b7bbccjpeg.jpeg",
        "https://fuss10.elemecdn.com/1/8e/aeffeb4de74e2fde4bd74fc7b4486jpeg.jpeg",
      ],
    };
  },
  methods: {
    onPreview() {
      this.showViewer = true;
    },
    closeViewer() {
      this.showViewer = false;
    },
  },
};
</script>

<style></style>