uview-plus组件库全面升级更新，订单结算判断支付方式是否可用代码调整，公众号关注二维码修改

uni_modules/uview-plus/components/u-back-top/u-back-top.vue

@@ -10,10 +10,10 @@
 		    v-if="!$slots.default && !$slots.$default"
 			@click="backToTop"
 		>
-			<u-icon
+			<up-icon
 			    :name="icon"
 			    :custom-style="iconStyle"
-			></u-icon>
+			></up-icon>
 			<text
 			    v-if="text"
 			    class="u-back-top__text"
@@ -111,7 +111,6 @@
 </script>
 
 <style lang="scss" scoped>
-	@import '../../libs/css/components.scss';
      $u-back-top-flex:1 !default;
      $u-back-top-height:100% !default;
      $u-back-top-background-color:#E1E1E1 !default;