fix: username length to 8

pages/appointment/appointment.js

@@ -42,7 +42,7 @@ Page({
   onShow() {
     this.getAccountNmberFn()
     this.setData({
-      appusername: app.globalData.userInfo.userName.length > 4 ? app.globalData.userInfo.userName.substring(0,4) : app.globalData.userInfo.userName,
+      appusername: app.globalData.userInfo.userName.length > 8 ? app.globalData.userInfo.userName.substring(0,4) : app.globalData.userInfo.userName,
       appuserheadimg: app.globalData.userInfo.headImg
     })
     if (app.globalData.navigateBackParams.address) {

pages/buy/buy.js

@@ -30,7 +30,7 @@ Page({
     this.getAccountNmberFn()
     this.setData({
       from: options.from,
-      appusername: app.globalData.userInfo.userName.length > 4 ? app.globalData.userInfo.userName.substring(0,4) : app.globalData.userInfo.userName,
+      appusername: app.globalData.userInfo.userName.length > 8 ? app.globalData.userInfo.userName.substring(0,4) : app.globalData.userInfo.userName,
       appuserheadimg: app.globalData.userInfo.headImg
     })
   },