小编hb2*_*b22的帖子

我正在尝试将 MongoDB atlas 实例连接到 nodejs/express 服务器：

const mongoose = require("mongoose");

const dbURI =
 "mongodb+srv://(url copied from atlas connect)";

const options = {
  useNewUrlParser: true,
  dbName: "data"
};

mongoose.connect(dbURI, options).then(
 () => {
   console.log("Database connection established!");
 },
 err => {
   console.log("Error connecting Database instance due to: ", err);
 }
);

但我不断收到以下错误：

MongoNetworkError: connection 5 to cluster ... 27017 在 TLSSocket 关闭。...

我怎样才能解决这个问题？

我在屏幕上有 4 个 SpriteNode，我希望它们不要相互反弹，而是相互流动，同时保持与某些 SpriteNode 和屏幕框架的碰撞。我已经为所有这些声明了类别：

let BCategory  : UInt32 = 0x1 << 0
let B2Category : UInt32 = 0x1 << 1
let B3Category : UInt32 = 0x1 << 2
let B4Category : UInt32 = 0x1 << 3
let BotCategory : UInt32 = 0x1 << 4
let PadCategory : UInt32 = 0x1 << 5
let WallCategory : UInt32 = 0x1 << 6

并添加了位掩码：

    b.physicsBody!.categoryBitMask = BCategory
    b2.physicsBody!.categoryBitMask = B2Category
    b3.physicsBody!.categoryBitMask = B3Category
    b4.physicsBody!.categoryBitMask = B4Category

    p.physicsBody!.categoryBitMask = PadCategory
    wall.categoryBitMask = …

我已经实现了一个导航抽屉，但我无法显示标题/操作栏

const RootStack = createDrawerNavigator(
  {
    Home: HomeScreen,
    Details: DetailsScreen,
  },
  {
    intialRouteName: 'Home',
    navigationOptions: {
      headerStyle : {
        backgroundColor: '#f4511e',
      },
      headerTintColor: '#fff',
      headerTitleStyle : {
        color: 'white',
      },
    },
  }
);


export default class App extends React.Component {
  render() {
    return <RootStack/>;
  }
}

有没有办法使用抽屉导航和标题栏？