以下是官方的写法，并不能达到我们的要求，官方实现的功能是点击图片达到预览大图的效果。如果你的按钮就是图片，也可以达到目前的功能

<div class="demo-image__preview"><el-imagestyle="width: 100px; height: 100px" ref="previewImg":src="url":preview-src-list="srcList"></el-image>
</div>
<el-button type="danger" @click="viewBigPicture">点击按钮查看大图</el-button><script lang="ts" setup>import { ref, computed, reactive, defineComponent } from 'vue'const previewImg = ref(null)const viewBigPicture = () =>{previewImg.value.clickHandler()}</script>

<template><div class="demo-image__preview"><el-imagestyle="width: 100px; height: 100px":src="url":preview-src-list="srcList":initial-index="4"fit="cover"/></div>
</template><script lang="ts" setup>
const url ='https://fuss10.elemecdn.com/a/3f/3302e58f9a181d2509f3dc0fa68b0jpeg.jpeg'
const srcList = ['https://fuss10.elemecdn.com/a/3f/3302e58f9a181d2509f3dc0fa68b0jpeg.jpeg','https://fuss10.elemecdn.com/1/34/19aa98b1fcb2781c4fba33d850549jpeg.jpeg','https://fuss10.elemecdn.com/0/6f/e35ff375812e6b0020b6b4e8f9583jpeg.jpeg','https://fuss10.elemecdn.com/9/bb/e27858e973f5d7d3904835f46abbdjpeg.jpeg','https://fuss10.elemecdn.com/d/e6/c4d93a3805b3ce3f323f7974e6f78jpeg.jpeg','https://fuss10.elemecdn.com/3/28/bbf893f792f03a54408b3b7a7ebf0jpeg.jpeg','https://fuss10.elemecdn.com/2/11/6535bcfb26e4c79b48ddde44f4b6fjpeg.jpeg',
]
</script><style scoped>
.demo-image__error .image-slot {font-size: 30px;
}
.demo-image__error .image-slot .el-icon {font-size: 30px;
}
.demo-image__error .el-image {width: 100%;height: 200px;
}
</style>