代码优化，结构调整，进度50%

src/layout/components/Sidebar/Link.vue

@@ -0,0 +1,39 @@
+
+<template>
+  <!-- eslint-disable vue/require-component-is-->
+  <component v-bind="linkProps(to)">
+    <slot/>
+  </component>
+</template>
+
+<script>
+import { isExternal } from '@/utils'
+
+export default {
+  props: {
+    to: {
+      type: String,
+      required: true
+    }
+  },
+  methods: {
+    isExternalLink(routePath) {
+      return isExternal(routePath)
+    },
+    linkProps(url) {
+      if (this.isExternalLink(url)) {
+        return {
+          is: 'a',
+          href: url,
+          target: '_blank',
+          rel: 'noopener'
+        }
+      }
+      return {
+        is: 'router-link',
+        to: url
+      }
+    }
+  }
+}
+</script>