Redux源码解读--（3）bindActionCreators

首先看一下函数的使用场景：

@connect(
    state => {
        const {  } = state;
        return {  }
    },
    dispatch => ({
        actions: bindActionCreators({ ...actions, ...otheractions }, dispatch)
    })
)

没错，就是配合connect使用的函数。他接收actions的集合和一个dispatch作为参数，效果说白了就是用dispatch给action包起来了。

function bindActionCreator(actionCreator, dispatch) {
  return (...args) => dispatch(actionCreator(...args))
}

export default function bindActionCreators(actionCreators, dispatch) {
  if (typeof actionCreators === 'function') {  //官方解释为：你可以只传入一个函数为参数，他会给这个函数的返回结果添加diapatch处理。
    return bindActionCreator(actionCreators, dispatch)
  }

  if (typeof actionCreators !== 'object' || actionCreators === null) {
    throw new Error(
      `bindActionCreators expected an object or a function, instead received ${actionCreators === null ? 'null' : typeof actionCreators}. ` +
      `Did you write "import ActionCreators from" instead of "import * as ActionCreators from"?`
    )
  }   //类型不符合抛出错误。

  const keys = Object.keys(actionCreators)
  const boundActionCreators = {}
  for (let i = 0; i < keys.length; i++) {
    const key = keys[i]
    const actionCreator = actionCreators[key]   //根据传入参数的key获得value,actionCreator,顾名思义，返回action的函数。
    if (typeof actionCreator === 'function') {
      boundActionCreators[key] = bindActionCreator(actionCreator, dispatch)
    }  //
  }
  return boundActionCreators   //为其添加dispatch并返回。
}

由上述代码可知：我传入的...actions,应该为   xxx:createAction("XXXXXX")

或者   xxx = createAction("XXXXXX"),这个时候只要传一个xxx就可以了。