bug fix and performance improvements

miniprogram/miniprogram_npm/tdesign-miniprogram/back-top/back-top.d.ts

@@ -0,0 +1,24 @@
+import { SuperComponent, RelationsOptions } from '../common/src/index';
+export default class BackTop extends SuperComponent {
+    externalClasses: string[];
+    options: {
+        multipleSlots: boolean;
+    };
+    properties: import("./type").TdBackTopProps;
+    relations: RelationsOptions;
+    data: {
+        prefix: string;
+        classPrefix: string;
+        _icon: any;
+    };
+    observers: {
+        icon(): void;
+    };
+    lifetimes: {
+        ready(): void;
+    };
+    methods: {
+        setIcon(v: any): void;
+        toTop(): void;
+    };
+}