Question

即使再次触发PROJECTS_SUCCEDED后，Redux传奇也将无限循环运行，并运行回fetchData方法。请在下面找到saga代码

import axios from 'axios';
import { put, all, take, call, takeLatest , takeEvery} from 'redux-saga/effects';
import actions from './actions';

const getRequest =  () =>{
    const data =  fetch('https://jsonplaceholder.typicode.com/todos/1')
                    .then( res => res.json())
                    .catch(err => {throw err});
    return data;
}

 function* fetchData(action) {
    console.log('fetchdata');
    try{
        const data = yield call(getRequest);
        console.log(data)
        yield put({type:actions.PROJECTS_SUCCEDED, payload:data});
    }
    catch (err){
        yield put({type:actions.PROJECTS_FAILED,err:err});
    }
}

function* dashboardSaga(){
    console.log('saga ran once')
    yield  takeLatest(actions.projectsRequested, fetchData);        
}

export default dashboardSaga;

并在componentDidMount中调用该动作

componentDidMount() {
        this.props.projectsRequested();
    }

并且根传奇是

import { all } from 'redux-saga/effects';
import homeSaga from './dashboard/sagas';

export default function* rootSaga(getState) {
    yield all([
        homeSaga(),
    ]);
}

Answer 1

能够通过将生命周期方法更改为componentWillMount而不是componentDidMount来解决上述问题

Answer 2

在这里您需要使用操作类型进行请求

function* dashboardSaga(){ console.log('saga ran once') yield takeLatest(actions.PROJECTS_REQUESTING, fetchData); }

Redux-Saga无限循环运行

2 个答案: