如何使用带有异步回调函数的redux-saga

时间:2018-04-16 13:53:40

标签: reactjs redux-saga fingerprintjs2

我想使用带有异步函数的redux-saga yield call 效果来获取此函数的结果。 (在这种情况下是fingerprintjs,但它是一般情况)

这是我想要的异步函数:

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执行此函数的问题,但它总是停留在yield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);

也尝试这样:

import Fingerprint2 from 'fingerprintjs2';

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

就像这样:

import Fingerprint2 from 'fingerprintjs2';

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

任何人都知道想法或某种方式来实现我的目标吗?

谢谢!

2 个答案:

答案 0 :(得分:0)

yield可以接受承诺。

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

答案 1 :(得分:0)

对于任何想回答这个问题的人,都有一些服务选择:

使用cps:

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

有前途:

 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