Vue El-descriptions 描述列表功能实现

<el-descriptions title="用户信息">
    <el-descriptions-item label="用户名">kooriookami</el-descriptions-item>
    <el-descriptions-item label="手机号">18100000000</el-descriptions-item>
    <el-descriptions-item label="居住地">苏州市</el-descriptions-item>
    <el-descriptions-item label="备注">
      <el-tag size="small">学校</el-tag>
    </el-descriptions-item>
    <el-descriptions-item label="联系地址">江苏省苏州市吴中区吴中大道 1188 号</el-descriptions-item>
</el-descriptions>

// 描述列表无数据时显示 '-'
.el-descriptions
	.el-descriptions__body
	.el-descriptions-item__content:empty::after,
.el-descriptions
	.el-descriptions__body
	.el-descriptions-item__content
	> div:empty::after,
.el-descriptions
	.el-descriptions__body
	.el-descriptions-item__content
	> div
	> div:empty::after,
.el-descriptions
	.el-descriptions__body
	.el-descriptions-item__content
	.approval:empty::after,
.el-descriptions
	.el-descriptions__body
	.el-descriptions-item__content
	div:empty::after,
.el-descriptions
	.el-descriptions__body
	.el-descriptions-item__content
	.line-limit-length:empty::after {
	content: '-';
}