使用Promise / Async选择要使用的数据

Question

我在下面尝试了访问data和json值，但是我现在只能访问data值，我也可以访问json值怎么办？

 const getUser = user => new Promise(async (resolve, reject) => { try { const read = await snekfetch.get('https://www.website.nl/api/public/users?name=' + user); const data = JSON.parse(read.text); const result = await snekfetch.get('https://www.website.com/api/public/users/' + data.uniqueId + '/profile'); const json = JSON.parse(result.text); resolve(data, json); } catch (error) { reject(error); } }); const promise = Promise.resolve(getUser(args[0])); promise.then(function(data, json) { const name = data.name; const motto = data.motto; const memberSince = data.memberSince; const groups = json.groups.length; const badges = json.badges.length; const friends = json.friends.length; const rooms = json.rooms.length; message.channel.send(`${name}\\n${motto}\\n${memberSince}\\n${groups || 'N/A'}\\n${badges || 'N/A'}\\n${friends || 'N/A'}\\n${rooms || 'N/A'}\\n`); }).catch(function(err) { console.log(err); return message.reply(`${args[0]} does not exists.`); }); 

Answer 1

兑现承诺时，您将您要兑现的数据传递给单个值。 如果要解析多个数据，则将它们粘贴在一个对象中并使用该对象进行解析

const getUser = user => new Promise(async (resolve, reject) => {
  try {
    const read = await snekfetch.get('https://www.website.nl/api/public/users?name=' + user);
    const data = JSON.parse(read.text);
    const result = await snekfetch.get('https://www.website.com/api/public/users/' + data.uniqueId + '/profile');
    const json = JSON.parse(result.text);
    resolve({ data, json }); // <--- created an object with two properties
  } catch (error) {
    reject(error);
  }
});

getUser('someUser')
  .then((result) => {
    console.log(result.data)
    console.log(result.json)
  })

另外，我想指出的是，您在不需要它们的地方创建了额外的承诺。 异步函数会自动创建Promise，因此您的getUser函数可以是：

const getUser = async (user) => {
  const read = await snekfetch.get('https://www.website.nl/api/public/users?name=' + user);
  const data = JSON.parse(read.text);
  const result = await snekfetch.get('https://www.website.com/api/public/users/' + data.uniqueId + '/profile');
  const json = JSON.parse(result.text);
  return { data, json };
}