## redux-logger ``` import redxLogger from 'redux-logger'; export default createStore(reducer,applyMiddleware(reduxLogger)); ``` 每次狀態改變時，會打印改變前以及改變后的狀態以及對應的action  ## redux-thunk ``` npm i redux-thunk ```  ## redux-promise reject的話 會被忽略 ``` //1) ,promiseIncrement(){ return new Promise(function(resolve,reject){ setTimeout(function(){ resolve({type:types.INCREMENT,payload:1}); //reject無法處理 },1000) }); } ``` 想要不被忽略，直接返回`{}`action對象 ``` //2) ,payloadIncrement(){ return { type:types.INCREMENT ,payload:new Promise(function(resolve,reject){ setTimeout(function(){ if(Math.random()>.5){ resolve(100); }else{ reject(-100); } },1000) }) } } ```