bindActionCreators

function bindActionCreator(actionCreator, dispatch) {
  return (...args) => {
    dispatch(actionCreator.apply(this, args)) // 同步的方法
  }
}
function bindActionCreators(actionCreators, dispatch) {
  if(typeof actionCreators === 'function') {
    return bindActionCreator(actionCreators, dispatch)
  }
  if(Object.prototype.toString.call(actionCreators) !== "[object Object]") {
    throw new Error('actionCreators 必须是对象格式')
  }
  const bondActionCreators = {}
  const actionKeys = Object.keys(actionCreators)
  // 如果是对象就迭代绑定这个对象
  for(const key of actionKeys) {
    const value = actionCreators[key]
    bondActionCreators[key] = bindActionCreator(value, dispatch)
  }
  return bondActionCreators
}
export default bindActionCreators