Azure在连接到SyntaxError时遇到“cosmosClient.databases.createIfNotExists:意外标识符- cosmosClient.databases.createIfNotExists”失败

Question

我是一个非常新的Azure机器人服务和整个Azure平台。我正在尝试使用node.js创建一个聊天机器人，但是当我试图连接到CosmosDB时，我得到了下面的错误。

在我添加下面的代码连接到CosmosDB之前，机器人运行得很好。

任何有关这方面的帮助或指导将不胜感激！

P.S. -我添加了'@azure/cosmos‘包，如果我只删除了try-catch段，代码就会运行，没有任何错误。

连接到CosmosDB:的代码

var async=require("async"); 
var await=require("await"); 

const CosmosClientInterface = require("@azure/cosmos").CosmosClient;
const databaseId = "ToDoList"; 
const containerId = "custInfo"; 

const endpoint = "<Have provided the Endpoint URL here>";
const authKey = "<Have provided the AuthKey here>";

const cosmosClient = new CosmosClientInterface({
    endpoint: endpoint,
    auth: {
      masterKey: authKey
    },
    consistencyLevel: "Session"
  });

async function readDatabase() {
   const { body: databaseDefinition } = await cosmosClient.database(databaseId).read();
   console.log(`Reading database:\n${databaseDefinition.id}\n`);
}

错误消息：

Sat Jan 12 2019 03:40:08 GMT+0000 (Coordinated Universal Time): Application has thrown an uncaught exception and is terminated:
D:\home\site\wwwroot\app.js:40
async function readDatabase() {
      ^^^^^^^^
SyntaxError: Unexpected token function
    at Object.exports.runInThisContext (vm.js:76:16)
    at Module._compile (module.js:542:28)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (D:\Program Files (x86)\iisnode\interceptor.js:459:1)
    at Module._compile (module.js:570:32)
Application has thrown an uncaught exception and is terminated:
D:\home\site\wwwroot\app.js:40
async function readDatabase() {
      ^^^^^^^^
SyntaxError: Unexpected token function
    at Object.exports.runInThisContext (vm.js:76:16)
    at Module._compile (module.js:542:28)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (D:\Program Files (x86)\iisnode\interceptor.js:459:1)
    at Module._compile (module.js:570:32)

Answer 1

您不能在没有async函数的情况下等待。

将所有代码转储到async function main(){}方法中，然后调用main().catch((err) => console.log(err));或其他类似的东西来启动承诺并处理错误。

在这个示例中可以看到这种模式的示例：https://github.com/Azure/azure-cosmos-js/blob/master/samples/ChangeFeed/app.js#L33

编辑1

下面是你的样本，上面写着承诺：

const CosmosClientInterface = require("@azure/cosmos").CosmosClient;
const databaseId = "ToDoList"; 
const containerId = "custInfo"; 

const endpoint = "<Have provided the Endpoint URL here>";
const authKey = "<Have provided the AuthKey here>";

const cosmosClient = new CosmosClientInterface({
    endpoint: endpoint,
    auth: {
      masterKey: authKey
    },
    consistencyLevel: "Session"
  });

cosmosClient.database(databaseId).read().then(({body: databaseDefinition}) => {
   console.log(`Reading database:\n${databaseDefinition.id}\n`);
}).catch((err) {
   console.err("Something went wrong" + err);
});

对于上面的示例，您不需要导入异步/等待，它们现在是JavaScript中的关键字。

下面是一篇比较和对比异步/等待和承诺的博客文章：https://hackernoon.com/should-i-use-promises-or-async-await-126ab5c98789