Javascript 成功操作运行多次

我正在使用redux saga从服务器获取异步操作的数据。我可以获取数据，但我认为我做得不够有效。因为我的电子邮件服务获取成功操作会运行多次。在给出示例之前，我想澄清一下我的应用程序结构

AdminDashboardadmin/dashboard-具有 侧导航和路由组件作为子组件

SideNavigation有一些链接，单击这些链接将在 页面中间，侧导航旁边

现在问题来了。当我进入route/admin/dashboard/email_服务时，我得到了我所期望的数据。之后，如果我点击一些其他链接并返回电子邮件服务，那么成功行动会被多次触发，并且会不断增加

index.js

---

好的，我查看了您的回购协议，发现了问题：

这是EmailService/sagas.js中的代码，请检查我添加的注释

function* setupemailService(action) {
  const successWatcher = yield fork(redirectOnSuccess);
  yield fork(...);

  // 1. On LOCATION_CHANGE you are only cancelling the `successWatcher`
  yield take([LOCATION_CHANGE, EMAIL_SERVICE_SETUP_FAILURE]);
  yield cancel(successWatcher);
}

function* emailServiceWatcher() {

  yield takeLatest(EMAIL_SERVICE_SETUP_REQUEST, setupemailService);

  // 2. you never cancelled `EMAIL_SERVICE_FETCH_REQUEST` watcher
  yield takeLatest(EMAIL_SERVICE_FETCH_REQUEST, fetchemailService);
}

export default [emailServiceWatcher];

你需要做的就是这样

function* emailServiceWatcher() {
  const setupeWatcher = yield takeLatest(EMAIL_SERVICE_SETUP_REQUEST, setupemailService);
  const fetchWatcher = yield takeLatest(EMAIL_SERVICE_FETCH_REQUEST, fetchemailService);
  // Cancel these watchers on LOCATION_CHANGE
  yield take([LOCATION_CHANGE]);
  yield cancel(setupeWatcher);
  yield cancel(fetcheWatcher);

}

---

您在哪里调用sagaMiddleware.run？在导航中，您似乎再次运行了saga中间件？另外，如果您登录fetchemailService生成器函数，在收到电子邮件\u SERVICE\u FETCH\u请求后会调用它多少次这是我的github repo。我认为共享repo会很好，因为我正在做异步路由，你测试过吗？我确实更改了异步sagas代码，该代码对我也适用，但您的解决方案在其他时间也适用。

function* emailServiceWatcher() {
  const setupeWatcher = yield takeLatest(EMAIL_SERVICE_SETUP_REQUEST, setupemailService);
  const fetchWatcher = yield takeLatest(EMAIL_SERVICE_FETCH_REQUEST, fetchemailService);
  // Cancel these watchers on LOCATION_CHANGE
  yield take([LOCATION_CHANGE]);
  yield cancel(setupeWatcher);
  yield cancel(fetcheWatcher);

}