element-ui upload组件上传图片后怎么在显示的内容区加一个框，让显示的内容可以滚动？

Question

Answer 1

1、设置样式
:root {
--border-width: 0px;
}
.el-upload-list {
border: var(--border-width) solid red;
}
2、监听列表，判断是否显示边框

watch: {
fileList: {
  deep: true,
  handler: function(newValue, oldValue) {
    let borderWidth = newValue.length ? "1px" : "0px";
    document.getElementsByTagName('body')[0].style.setProperty('--border-width', borderWidth);
  }
}

},

3、上传或移除时，fileList需重新赋值，否则无法监听数组的变化

handelSuccess(response, file, fileList){
  this.fileList = fileList;
},
handleRemove(file, fileList) {
  this.fileList = fileList;
},

Answer 2

感谢大佬的回答，还有疑问