如何在 redux "timeoutScheduler" 中间件文档示例中使用取消功能?

How to use the cancel function in redux "timeoutScheduler" middleware docs example?

当我实现 MW 时效果很好,但我如何调用 "cancel" 函数 如果我想清除超时? 这是代码:(taken from Redux middleware)

   /**
 * Schedules actions with { meta: { delay: N } } to be delayed by N milliseconds.
 * Makes `dispatch` return a function to cancel the timeout in this case.
 */
const timeoutScheduler = store => next => action => {
  if (!action.meta || !action.meta.delay) {
    return next(action)
  }
​
  const timeoutId = setTimeout(
    () => next(action),
    action.meta.delay
  )
​
  return function cancel() {
    clearTimeout(timeoutId)
  }
}

假设链中的所有其他中间件正确执行 return next(action),那么您对 ​​dispatch() 的调用将 return 这个 cancel 函数。例如:

const cancel = store.dispatch({type : "INCREMENT", meta : {delay : 1000}});

// kill it off
cancel();

或者,与 React 组件中的绑定动作创建者类似:

// assume we have an action creator like this passed to connect():
function incrementWithDelay() {
    return {type : "INCREMENT", meta : {delay : 1000}};
}


const cancel = this.props.incrementWithDelay();
cancel();