refactor: 重构二维码弹窗组件为命令式调用

pages/index/index.js

@@ -6,9 +6,7 @@ Page({
   data: {
     isLoggedIn: false,
     loginFailed: false,
-    latestRecord: null,
-    qrcodeVisible: false,
-    qrcodeId: ''
+    latestRecord: null
   },
 
   onLoad() {
@@ -82,11 +80,6 @@ Page({
   },
 
   showQrcode(e) {
-    const id = e.currentTarget.dataset.id
-    this.setData({ qrcodeVisible: true, qrcodeId: id })
-  },
-
-  hideQrcode() {
-    this.setData({ qrcodeVisible: false, qrcodeId: '' })
+    this.selectComponent('#qrcodeModal').show(e.currentTarget.dataset.id)
   }
 })