效果图：

代码

mappingEmp:{},

<el-select v-model="mappingEmp" value-key="id" filterable clearable placeholder="请输入工号或姓名">
	<el-option
	    key="0"
	    label=""
	    value=""
	    disabled>
	    <span style="float: left">姓名</span>
	    <span style="float: right; color: #8492a6; font-size: 13px">工号</span>
	</el-option>
	<el-option
	v-for="item in formSearch.empList"
	:key="item.id"
	:label="`${item.name}(${item.empId})`"
	:value="item">
	<span style="float: left">{{ item.name }}</span>
	<span style="float: right; color: #8492a6; font-size: 13px">{{ item.empId }}</span>
	</el-option>
	</el-select>