el-upload上传单个图片显示缩略图_el-upload缩略图

问题概述：

在使用element-ui的el-upload上传文件时，要显示缩略图，但是官方给出的显示缩略图模板是picture-card类型的，如果要上传单个文件或图片并显示缩略图，我暂时还没有觉接办法，所以只能模仿官方给出的图片列表类型自定义单个图片上传样式。

<!-- 缩略图显示-->
<div class="img-show" v-if="imgUrl">
	<img :src="imgUrl" class="avatar">
	<span class="actions">
		<!-- 放大 -->
		<span class="item">
			<i class="el-icon-zoom-in" @click="enlarge()"></i>
		</span>
		<!-- 删除 -->
		<span class="item">
			<i class="el-icon-delete" @click="del()"></i>
		</span>
	</span>
</div>
<!-- 图片上传 -->
<el-upload 
v-else
action="#"
class="uploader-avatar" 
list-type="picture"
:auto-upload="false" 
:show-file-list="false"
:on-change="imgPreview">
	<i class="el-icon-plus avatar-uploader-icon"></i>
</el-upload>
<!-- 图片显示对话框 -->
<el-dialog :visible.sync="dialogVisible">
	<img width="100%" :src="dialogUrl" alt="">
</el-dialog>

<script>
export default {
    data() {
        return {
            imgUrl: '',
            dialogVisible: false,
            dialogUrl: ''
        }
    },
    methods: {
        //图片缩略图
        imgPreview: function(file){
                //生成临时缩略图
                this.imgUrl =  URL.createObjectURL(file.raw);
        },
        enlarge: function(){
            this.dialogVisible = true;
            this.dialogUrl = this.imgUrl;
        },
        del: function(){
            this.imgUrl =  '';
            this.dialogUrl = '';
        }
    }
}
</script>

<style scoped>

.uploader-avatar>>>.el-upload {
    background-color: #fbfdff;
    border: 1px dashed #c0ccda;
    border-radius: 6px;
    box-sizing: border-box;
    width: 148px;
    height: 148px;
    cursor: pointer;
    line-height: 146px;
    vertical-align: top;
    overflow: hidden;
}
.img-show{
    position: relative;
    border: 1px solid #c0ccda;
    border-radius: 6px;
    box-sizing: border-box;
    width: 148px;
    height: 148px;
    cursor: pointer;
    overflow: hidden;
}
.uploader-avatar>>>.el-upload:hover {
    border-color: #409EFF;
}
.uploader-avatar>>>i {
    font-size: 28px;
    color: #8c939d;
}
.avatar{
    width: 148px;
    height: 148px;
    display: block;
}

.actions{
    position: absolute;
    width: 100%;
    height: 100%;
    line-height: 148px;
    left: 0;
    top: 0;
    cursor: default;
    text-align: center;
    color: #fff;
    opacity: 0;
    font-size: 20px;
    background-color: rgba(0,0,0,.5);
    transition: opacity .3s;
}
.actions:hover{
    opacity: 1;
}
.actions:hover span{
    display: inline-block;
}
.actions span{
    display: none;
    margin: 0 16px;
    cursor: pointer;
}

</style>
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效果显示：