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<!DOCTYPE html>
<html>
<head>
  <script src="//cdn.bootcss.com/redux/3.5.2/redux.min.js"></script>
</head>
<body>
<script>
/** Action Creators */
function inc() {
  return { type: 'INCREMENT' };
}
function dec() {
  return { type: 'DECREMENT' };
}
​
function reducer(state, action) {
  // 首次调用本函数时设置初始 state
  state = state || { counter: 0 };
​
  switch (action.type) {
    case 'INCREMENT':
      return { counter: state.counter + 1 };
    case 'DECREMENT':
      return { counter: state.counter - 1 };
    default:
      return state; // 无论如何都返回一个 state
  }
}
​
var store = Redux.createStore(reducer);
​
console.log( store.getState() ); // { counter: 0 }
​
store.dispatch(inc());
console.log( store.getState() ); // { counter: 1 }
​
store.dispatch(inc());
console.log( store.getState() ); // { counter: 2 }
​
store.dispatch(dec());
console.log( store.getState() ); // { counter: 1 }
</script>
</body>
</html>
​
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