react Cannot GET /

如果是路由都配置好了，也没有报其他的编译错误，如下：

import dva, { connect } from 'dva';
import { Router, Route } from 'dva/router';
import React from 'react';
import styles from './index.less';
import key from 'keymaster';

const app = dva();

app.model({
  namespace: 'count',
  state: {
    record: 0,
    current: 0,
  },
  reducers: {
    add(state) {
      const newCurrent = state.current + 1;
      return { ...state,
        record: newCurrent > state.record ? newCurrent : state.record,
        current: newCurrent,
      };
    },
    minus(state) {
      return { ...state, current: state.current - 1};
    },
  },
  effects: {
    *add(action, { call, put }) {
      yield call(delay, 1000);
      yield put({ type: 'minus' });
    },
  },
  subscriptions: {
    keyboardWatcher({ dispatch }) {
      key('⌘+up, ctrl+up', () => { dispatch({type:'add'}) });
    },
  },
});

const CountApp = ({count, dispatch}) => {
  return (
    

      
Highest Record: {count.record}
      
{count.current}
      

        () => { dispatch({type: 'count/add'}); }}>+
      
    
  );
};


// Helpers

function delay(timeout){
  return new Promise(resolve => {
    setTimeout(resolve, timeout);
  });
}

function mapStateToProps(state) {
  return { count: state.count };
}
const HomePage = connect(mapStateToProps)(CountApp);
// const HomePage = () => 
Hello Dva.
;



app.router(({history}) =>
  
    "/" component={HomePage} />
  
);
// ---------


app.start('#root');

那就说明你没有把 index.html 文件引入进来，加上 import ‘./index.html’; 这句话就好了

import dva, { connect } from 'dva';
import { Router, Route } from 'dva/router';
import React from 'react';
import styles from './index.less';
import key from 'keymaster';
import './index.html';

const app = dva();

app.model({
  namespace: 'count',
  state: {
    record: 0,
    current: 0,
  },
  reducers: {
    add(state) {
      const newCurrent = state.current + 1;
      return { ...state,
        record: newCurrent > state.record ? newCurrent : state.record,
        current: newCurrent,
      };
    },
    minus(state) {
      return { ...state, current: state.current - 1};
    },
  },
  effects: {
    *add(action, { call, put }) {
      yield call(delay, 1000);
      yield put({ type: 'minus' });
    },
  },
  subscriptions: {
    keyboardWatcher({ dispatch }) {
      key('⌘+up, ctrl+up', () => { dispatch({type:'add'}) });
    },
  },
});

const CountApp = ({count, dispatch}) => {
  return (
    

      
Highest Record: {count.record}
      
{count.current}
      

        () => { dispatch({type: 'count/add'}); }}>+
      
    
  );
};


// Helpers

function delay(timeout){
  return new Promise(resolve => {
    setTimeout(resolve, timeout);
  });
}

function mapStateToProps(state) {
  return { count: state.count };
}
const HomePage = connect(mapStateToProps)(CountApp);
// const HomePage = () => 
Hello Dva.
;



app.router(({history}) =>
  
    "/" component={HomePage} />
  
);
// ---------


app.start('#root');