关键点：slot="label"
<el-tab-pane name="5" label="组合关系"> <span slot="label"> <span class="span-box"> <span>{{ item.label }}</span> <el-tooltip class="item" effect="dark" content="提示 " placement="bottom-start" > <i class="el-icon-question"></i> </el-tooltip> </span> </span> <syntagmatic :nodeId="nodeId" :nodeInfo="nodeInfo"></syntagmatic> </el-tab-pane>效果展示：
总结：label标签都可按此方法添加自定义图标
