早就实现了功能，但是发现点击的时候，选中的菜单项背景色会变白，周五时候仔细观察了一下，发现并不是调整样式的问题，而是选项没有被选中，于是好好研究了一下组件递归这块，总结记录一下心路历程
一、概念
递归：递归其实说白了，就是自己调用自己，样子就像是套娃一个套一个的，小时候玩过一个游戏汉诺塔就是利用的递归原理：
函数递归：函数利用函数名还调用自己
组件递归：所以组件递归利用的是vue组件中的name属性来实现的
二、需求
实现可折叠动态渲染多级侧边栏导航
三、分析
1、观察到侧边栏导航是一级一级的，第二级就相当于再重复一遍第一级 2、有一个特点，有的菜单有下级，有的没有下一级 3、动态渲染，说明是从后台接口获取的树类型数据，动态的渲染上去 四、代码实现 1、首先先执行一下文档里的demo试一下：
文档：element文档
2、改成自己需要的样式，第一次是这么写的
父组件SideBar
{{item.name}} {{item.name}}
子组件SideBarItem
后来发现折叠不成功，而且选中之后选中项样式没变，后来发现是没选中，研究发现是因为多嵌套了一层div，而且用了el-menu-item-group项目中并不需要这个，于是改进如下：
父组件SideBar
子组件SideBarItem
{{ menu.name }}
{{ menu.name }}
功能基本实现，但是出现一个bug，当鼠标点折叠时，会出现循环调用某个事件，导致栈溢出报错，查看文章只需对子菜单设置属性 :popper-append-to-body=“false” 即可
参考文章：Element-ui NavMenu子菜单使用递归生成时使用报错
最后附上简单的测试数据：
testData: [
{"id":"34161C2E8-7348-4439-8899-9A8039AE6AE4","pid":"0","code":"HOME","name":"首页","path":"/home","type":null,"icon":null,"sysId":"2761C2E8-7348-4439-8899-9A8039AE6AE3","orderNo":0,"isCheck":null,"children":[]},
{"id":"703DBEBD-F92C-4347-9203-F60A73153C3F","pid":"0","code":"WD","name":"温度","path":"/temperature","type":null,"icon":null,"sysId":"2AB00274-73DF-459A-A02E-C79A4D8A8929","orderNo":0,"isCheck":null,"children":[]},
{"id":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","pid":"0","code":"BJ","name":"报警","path":"/alarm","type":null,"icon":null,"sysId":"2AB00274-73DF-459A-A02E-C79A4D8A8929","orderNo":0,"isCheck":null,
"children":[
{"id":"1C99333D-886F-4AD6-93C4-7C5244E48247","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"FD","name":"防盗","path":"/burg","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
{"id":"1DBDF678-F51F-444A-B995-61E5D9CCA5AF","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"JL","name":"警铃","path":"/bell","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
{"id":"BFC8C2E1-0E5B-4EEE-B91D-3DABC63FF481","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"JS","name":"浸水","path":"/immersion","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
{"id":"BFC8C2E1-0E5B-4EEE-B91D-3DABC63FF482","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"MJ","name":"门禁","path":"/punch","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
{"id":"BFC8C2E1-0E5B-4EEE-B91D-3DABC63FF483","pid":"73660AB4-48D3-4BDB-86FD-C8397D4D54EC","code":"ZT","name":"状态","path":"/state","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]}
]
},
{"id":"34161C2E8-7348-4439-8899-9A8039AE6AE5","pid":"0","code":"GZ","name":"工作","path":"/work","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,
"children":[]
},
{"id":"0CD6B09A-AA43-4AE9-9AC7-29BC5AC83495","pid":"0","code":"SJ","name":"数据","path":"/data","type":null,"icon":null,"sysId":"2AB00274-73DF-459A-A02E-C79A4D8A8929","orderNo":0,"isCheck":null,
"children":[]
},
{"id":"049C670D-A33E-4188-9206-B3F3B5DDE77B","pid":"0","code":"SP","name":"视频","path":"/video","type":null,"icon":null,"sysId":"3691C2E8-8848-4439-8899-9A8039AE6AB5","orderNo":0,"isCheck":null,"children":[]},
{"id":"0A15DBB6-3241-4C7F-AAD4-5417E7BBECAA","pid":"0","code":"RZ","name":"日志","path":"/log","type":null,"icon":null,"sysId":"2AB00274-73DF-459A-A02E-C79A4D8A8929","orderNo":0,"isCheck":null,
"children":[]
}
]
效果如图：
折叠后如图：
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