vue3+elementPlus：el-select选择器里添加按钮button

//html
<el-select class="selectIcon" value-key="id" v-model="store.state.HeaderfilterText" multiple collapse-tags
                    collapse-tags-tooltip placeholder="默认企业" style="width: 210px" @remove-tag="removeCheckTag"
                    @change="checkChange" >
                    <template #prefix>
                        <el-icon class="el-icon--left">
                            <svg viewBox="0 0 1024 1024" data-v-029747aa="">
                                <path fill="currentColor" d="M512 128 128 447.936V896h255.936V640H640v256h255.936V447.936z">
                                </path>
                            </svg>
                        </el-icon>
                    </template>
                    <el-option v-for="item in store.state.HeaderLists" :key="item.id" :label="item.companyName"
                   :value="item" @click.native="changeGateway(item)" >                    
                    </el-option>
                    <el-divider border-style="dashed" />
                    <el-button style="float:right;margin: -26px 0px 0 0;" @click="getGateway">确定</el-button>
                </el-select>

上一篇文章， 

vue3+elementPlus：element 面板的切换盒子的动态样式_意初的博客-CSDN博客vue3+elementPlus：element 面板的切换盒子的动态样式。style动态绑定一个函数，element 面板盒子样式，使用原生dom样式修改法https://blog.csdn.net/weixin_43928112/article/details/133680984