feat($parent): 放开入口，新增测试例子

pages/component-instance/parent/parent.uvue

 <template>
   <view class="page">
-    <child></child>
+    <form>
+      <child ref="child"></child>
+    </form>
+    <view>
+      <button @click="testParent" class="call-parent-func">调用组件所在页面方法</button>
+    </view>
+    <view>
+      <text>{{parentValue}}</text>
+    </view>
   </view>
 </template>
 
 <script>
-import child from './child.uvue'
+  import child from './child.uvue'
 
-export default {
-  components: {
-    child
-  },
-  data () {
-    return {
-      value: "parent"
-    }
-  },
-  methods: {
-    testFunction (): string {
-      return "parentFunctionResult"
+  export default {
+    components: {
+      child
+    },
+    data() {
+      return {
+        value: "parent",
+        parentValue: "123"
+      }
+    },
+    methods: {
+      testFunction() : string {
+        return "parentFunctionResult"
+      },
+      testParent() {
+        const child = this.$refs['child'] as ComponentPublicInstance
+        this.parentValue = child.$parent!.$callMethod('testFunction') as string
+      },
     }
   }
-}
 </script>
 
 <style>
   .page {
     display: flex;
-    flex-direction: row;
     justify-content: space-between;
   }
-</style>
+</style>
\ No newline at end of file

pages/tab-bar/options-api.uvue

@@ -306,12 +306,7 @@
               {
                 name: '$parent',
                 url: 'parent',
-                // #ifdef APP
                 enable: true,
-                // #endif
-                // #ifdef WEB
-                enable: false,
-                // #endif
               },
               {
                 name: '$root',