init project

qd/src/views/nested/menu1/index.vue

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+<template>
+  <router-view />
+</template>

qd/src/views/nested/menu1/menu1-1/index.vue

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+<template>
+  <div style="padding:30px;">
+    <el-input v-model="input" placeholder="请输入内容" />
+  </div>
+</template>
+<script>
+export default {
+  name: 'Test',
+  data() {
+    return {
+      input: ''
+    }
+  }
+}
+</script>

qd/src/views/nested/menu1/menu1-2/index.vue

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+<template>
+  <div style="padding:30px;">
+    <el-alert :closable="false" title="三级菜单2" type="success" />
+  </div>
+</template>

qd/src/views/nested/menu2/index.vue

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+<template>
+  <div style="padding:30px;">
+    <el-alert :closable="false" title="二级菜单" />
+  </div>
+</template>