<el-dropdown><span style="outline: none;">下拉菜单</span><template #dropdown><el-dropdown-menu><el-dropdown-item>Action 1</el-dropdown-item><el-dropdown-item>Action 2</el-dropdown-item></el-dropdown-menu></template></el-dropdown>
去掉黑框添加样式outline: none
下拉不显示，在el-dropdown-menu外层添加<template #dropdown>即可
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