循環中的意外“等待” no-await-in-loop

Question

我在以下循環中遇到錯誤：

循環中的意外await no-await-in-loop

const deviceSet = {};
for (const target of body.inputs[0].payload.devices) {
    const doc = await firestore().doc(`devices/${target.id}`).get();
    const device = Device.createDevice(doc.id, doc.data());
    deviceSet[device.id] = device.reportState;
   }

Answer 1

你可以試試老式的方法：

const deviceSet = {};
const target = body.inputs[0].payload.devices;
for (let i = 0; i < body.inputs[0].payload.devices; i++) {
    const doc = firestore().doc(`devices/${target[i].id}`).get();
    const device = Device.createDevice(doc.id, doc.data());
    deviceSet[device.id] = device.reportState;
   }

Answer 2

遞歸可以解決你的問題。 這不是經過測試的代碼，你可以按照這個想法工作

async function test(i = 0) {
  const deviceSet = {};
  const target = body.inputs[0].payload.devices;
  const doc = await firestore().doc(`devices/${target[i].id}`).get();
  const device = Device.createDevice(doc.id, doc.data());
  deviceSet[device.id] = device.reportState;
  if (i < body.inputs[0].payload.devices) {
    test(i + 1);
  }
}
test(0)