javascript 终极版，counter.html

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<!DOCTYPE html>
<html>
<head>
   <meta charset="utf-8" />
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <title>Counter Redux</title>
   <meta name="viewport" content="width=device-width, initial-scale=1">

   <!-- Redux CDN -->
   <script src="https://cdnjs.cloudflare.com/ajax/libs/redux/4.0.1/redux.min.js"></script>
</head>

<body>
   <!-- Render the store -->
   <p id="render-store"></p>
   <button id="add">+</button>
   <button id="remove">-</button>
   <button id="add10">+ 10</button>
   <button id="remove10">- 10</button>
   <button id="reset">Reset</button>

   <script src="main.js"></script>
</body>
</html>
// ACTIONS
const addAction = {
    type: 'ADD',
 };
const addAction10 = {
    type: 'ADD10',
 };
 
 const removeAction = {
    type: 'REMOVE',
 };
 const removeAction10 = {
    type: 'REMOVE10',
 };
 const resetAction = {
    type: 'RESET',
 };
 
 // REDUCER
 const counterReducer = (state = 0, action) => {
    switch (action.type) {
        case 'ADD':
            return state + 1;
        case 'REMOVE':
            return state - 1;    
        case 'ADD10':
            return state + 10;    
        case 'REMOVE10':
            return state - 10;    
        case 'RESET':
            return state = 0;    
        default:
            return state;
    }
 }
 
 // STORE
 const { createStore } = Redux;
 const store = createStore(counterReducer);
 
 
 // MAIN
 const renderStore = document.getElementById('render-store');
 const render = () => {
    renderStore.innerHTML = store.getState();
 }
 
 store.subscribe(render);
 render();
 
 const add = document.getElementById('add');
 add.addEventListener('click', () => {
    store.dispatch(addAction)
 });
 const add10 = document.getElementById('add10');
 add10.addEventListener('click', () => {
    store.dispatch(addAction10)
 });
 
 const remove = document.getElementById('remove');
 remove.addEventListener('click', () => {
    store.dispatch(removeAction)
 });
 const remove10 = document.getElementById('remove10');
 remove10.addEventListener('click', () => {
    store.dispatch(removeAction10)
 });
 const reset = document.getElementById('reset');
 reset.addEventListener('click', () => {
    store.dispatch(resetAction)
 });

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