commit：同步2.3版本

orange-demo-single-pg/orange-demo-single-pg-web/src/App.vue

@@ -0,0 +1,21 @@
+<template>
+  <div>
+    <router-view></router-view>
+  </div>
+</template>
+
+<script>
+import projectConfig from '@/core/config';
+
+export default {
+  watch: {
+    $route: {
+      handler (newValue) {
+        document.title = projectConfig.projectName;
+        if (newValue.meta && newValue.meta.title) document.title += ' - ' + newValue.meta.title;
+      },
+      immediate: true
+    }
+  }
+}
+</script>