feat(page): add pull-to-refresh and back-to-top component

1. enable pull-down refresh for the target page in pages.json
2. add scroll mixin and back-to-top component for form and formdata pages, show back-to-top button when scrolling down

pages.json

@@ -1245,6 +1245,7 @@
 						"navigationStyle": "custom",
 						// #endif
 						"navigationBarTitleText": "",
+						"enablePullDownRefresh": true,
 						"componentPlaceholder": {
 							"diy-article": "view",
 							"diy-audio": "view",

pages_tool/form/form.vue

@@ -14,11 +14,15 @@
 
         <loading-cover ref="loadingCover"></loading-cover>
         <ns-login ref="login"></ns-login>
+        <to-top v-if="showTop" @toTop="scrollToTopNative()"></to-top>
     </view>
 </template>
 
 <script>
+    import scroll from '@/common/js/scroll-view.js';
+
     export default {
+        mixins: [scroll],
         data() {
             return {
                 id: 0,

pages_tool/form/formdata.vue

@@ -19,17 +19,20 @@
 		</block>
 		<loading-cover ref="loadingCover"></loading-cover>
 		<ns-login ref="login"></ns-login>
+		<to-top v-if="showTop" @toTop="scrollToTopNative()"></to-top>
 	</view>
 </template>
 
 <script>
 
 import diyForm from '@/components-diy/diy-form.vue';
+import scroll from '@/common/js/scroll-view.js';
 
 export default {
 	components: {
 		diyForm
 	},
+	mixins: [scroll],
 	data() {
 		return {
 			id: 0,