菜单面包屑导航支持多层级显示

ruoyi-ui/src/components/Breadcrumb/index.vue

 <template>
   <el-breadcrumb class="app-breadcrumb" separator="/">
     <transition-group name="breadcrumb">
-      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
+      <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
         <span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{ item.meta.title }}</span>
         <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
       </el-breadcrumb-item>
@@ -31,14 +31,41 @@ export default {
   methods: {
     getBreadcrumb() {
       // only show routes with meta.title
-      let matched = this.$route.matched.filter(item => item.meta && item.meta.title)
-      const first = matched[0]
-
-      if (!this.isDashboard(first)) {
-        matched = [{ path: '/index', meta: { title: '首页' }}].concat(matched)
+      let matched = []
+      const router = this.$route
+      const pathNum = this.findPathNum(router.path)
+      // multi-level menu
+      if (pathNum > 2) {
+        const reg = /\/\w+/gi
+        const pathList = router.path.match(reg).map((item, index) => {
+          if (index !== 0) item = item.slice(1)
+          return item
+        })
+        this.getMatched(pathList, this.$store.getters.sidebarRouters, matched)
+      } else {
+        matched = router.matched.filter((item) => item.meta && item.meta.title)
+      }
+      if (!this.isDashboard(matched[0])) {
+        matched = [{ path: "/index", meta: { title: "首页" } }].concat(matched)
+      }
+      this.levelList = matched.filter((item) => item.meta && item.meta.title && item.meta.breadcrumb !== false)
+    },
+    findPathNum(str, char = "/") {
+      let index = str.indexOf(char)
+      let num = 0
+      while (index !== -1) {
+        num++
+        index = str.indexOf(char, index + 1)
+      }
+      return num
+    },
+    getMatched(pathList, routeList, matched) {
+      let data = routeList.find((item) => item.path == pathList[0])
+      matched.push(data)
+      if (data.children && pathList.length) {
+        pathList.shift()
+        this.getMatched(pathList, data.children, matched)
       }
-
-      this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
     },
     isDashboard(route) {
       const name = route && route.name
@@ -65,7 +92,6 @@ export default {
   font-size: 14px;
   line-height: 50px;
   margin-left: 8px;
-
   .no-redirect {
     color: #97a8be;
     cursor: text;