el-checkbox-group 必选

在el-checkbox-group中，设置必选项可以通过设置min属性来实现。min属性表示至少需要选择的项数。
#### 引用[.reference_title]
- *1* [vue element ＜el-checkbox-group＞ 选中原理](https://blog.csdn.net/jidushanzhu/article/details/114322898)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *2* [nested_el-checkbox:element-ui的el-checkbox实现嵌套多选，单选](https://download.csdn.net/download/weixin_42107561/18609162)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *3* [elcheckbox 点击自动全选问题解决](https://blog.csdn.net/shareye1992/article/details/117651887)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 33.333333333333336%"]
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