错误信息如下： 系统: {"language":"zh_CN","wifiEnabled":true,"bluetoothEnabled":false,"deviceOrientation":"portrait","locationAuthorized":true,"notificationSoundAuthorized":true,"screenHeight":667,"windowHeight":667,"system":"iOS 12.1.4","version":"7.0.3","fontSizeSetting":17,"notificationAuthorized":true,"statusBarHeight":20,"windowWidth":375,"pixelRatio":2,"notificationBadgeAuthorized":true,"model":"iPhone 7<iPhone9,1>","batteryLevel":63,"screenWidth":375,"locationEnabled":true,"microphoneAuthorized":true,"cameraAuthorized":true,"albumAuthorized":true,"notificationAlertAuthorized":true,"brand":"iPhone","platform":"ios","SDKVersion":"2.6.1"}                   当前socket的readyState = 3 错误信息: {"errMsg":"Error writing to stream."}

- 当前 Bug 的表现（可附上截图） 在非tabBar页面触发了wx.showTabBarRedDot() API后, 再返回tabBar页面,红点角标不显示 - 预期表现 能否在非tabBar页面触发后,返回红点角标也显示 - 复现路径 - 提供一个最简复现 Demo