如何将 Redux-saga 与异步回调函数一起使用



我想使用带有异步函数的 redux-saga yield 调用效果,该函数的结果是回调。(在这种情况下,指纹JS,但这是一般情况(

这是我想要确切的异步函数:

new Fingerprint2().get(function(result, components) {
console.log(result) // a hash, representing your device fingerprint
console.log(components) // an array of FP components
})

我想通过 saga 执行此功能的问题,但它总是卡在收益调用上。

我尝试了很多方法:

import Fingerprint2 from 'fingerprintjs2';
const func = new Fingerprint2().get;
const res = yield call(func);

也可以像这样尝试:

import Fingerprint2 from 'fingerprintjs2';
const func = new Fingerprint2().get;
const a = yield call(func, (fingerprint, result) => ({
  fingerprint,
  result
}));

像这样:

import Fingerprint2 from 'fingerprintjs2';
let res = yield call(new Fingerprint2().get(), (fingerprint, result) => ({
  fingerprint,
  result
}));

有人知道想法或实现我的目标的方法吗?

谢谢!

yield可以接受Promise。

const {result, components} = yield new Promise(resolve => {
  new Fingerprint2().get(function(result, components) {
    resolve({result, components})
  })
})

对于任何想要回答这个问题的人,都有薮猫选项:

使用 CPS:

const { result, components } = yield cps(cb => new Fingerprint2().get((result, components) => cb(null, { result, components })))

有承诺:

 function* rootSaga(){
// Wrapping you function into a promise
const promise = new Promise((resolve, reject) => {
  new Fingerprint2().get((result, components) => {
  resolve({ result, components })
})
})
 // Yield the promise And redux-saga will return the resolved value when the promise resolves
 const { result, components } = yield promise
// do some stuff about  result and components ...
}

信用:Redux-Saga GitHub

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