node.js：使用await消耗诺言

Question

我有以下消耗肥皂网络服务的代码：

var soap = require('soap');
var url = 'http://www.dataaccess.com/webservicesserver/numberconversion.wso?WSDL';
var args = { ubiNum: '1234' };

soap.createClientAsync(url).then((client) => {
  return client.NumberToWordsAsync(args);
}).then((result) => {
  console.log(result[0].NumberToWordsResult)
});

我正在尝试使用await重写它，这是我的尝试：

var soap = require('soap');
var url = 'http://www.dataaccess.com/webservicesserver/numberconversion.wso?WSDL';
var args = { ubiNum: '1234' };

var client = await soap.createClientAsync(url);
var result = await client.NumberToWordsAsync(args);
console.log(result[0].NumberToWordsResult)

但是我收到以下错误：

var client = await soap.createClientAsync(url);
             ^^^^^
SyntaxError: await is only valid in async function

我想念什么？

顺便说一句：如果有人想玩，这里是一个副本 ： https : //repl.it/@opensas/BasicNodeSoapClientWithPromises

Answer 1

await仅在异步函数内起作用。 除了异步函数，您不能放置await语句。 因此，您可以重写您的代码，例如

(async function() {
  var soap = require('soap');
  var url = 'http://www.dataaccess.com/webservicesserver/numberconversion.wso?WSDL';
  var args = { ubiNum: '1234' };

  var client = await soap.createClientAsync(url);
  var result = await client.NumberToWordsAsync(args);
  console.log(result[0].NumberToWordsResult);
})();