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redux example
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| <html> | |
| <body> | |
| <button onclick="s.dispatch('increment')">increment</button> | |
| <button onclick="s.dispatch('decrement')">decrement</button> | |
| <button onclick="unsubscribe()">unsubscribe</button> | |
| <div id="main"></div> | |
| <script> | |
| function Store(reducer) { | |
| this.reducer = reducer; | |
| this.listeners = []; | |
| } | |
| Store.prototype.getState = function() { | |
| return this.state; | |
| } | |
| Store.prototype.subscribe = function(listener) { | |
| this.listeners.push(listener); | |
| return () => { | |
| this.listeners = this.listeners.filter(l => l !== listener); | |
| } | |
| } | |
| Store.prototype.dispatch = function(action) { | |
| this.state = this.reducer(this.state, action); | |
| this.listeners.forEach(listener => listener()); | |
| } | |
| function counterReducer(state, action) { | |
| state = state || 0; | |
| if (action == 'increment') { | |
| return ++state | |
| } else if (action == 'decrement') { | |
| return --state | |
| } | |
| return state | |
| } | |
| const s = new Store(counterReducer); | |
| const unsubscribe = s.subscribe(() => { | |
| const main = document.querySelectorAll('#main')[0]; | |
| main.innerText = s.getState(); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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