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simple redux
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script> | |
| window.state = {counter: 0}; | |
| const listeners = []; | |
| const reducer = (state, action) => ({ | |
| INC: {...state, counter: state.counter + 1}, | |
| DEC: {...state, counter: state.counter - 1}, | |
| }[action.type] || state); | |
| const dispatch = (action) => { | |
| window.state = reducer(window.state, action); | |
| listeners.forEach(listener => listener()); | |
| } | |
| const subscribe = (callback) => listeners.push(callback); | |
| const render = () => document.getElementById('counter').innerText = window.state.counter; | |
| subscribe(render); | |
| </script> | |
| </head> | |
| <body> | |
| <span id="counter">0</span> | |
| <button onclick="dispatch({type: 'INC'})">+</button> | |
| <button onclick="dispatch({type: 'DEC'})">-</button> | |
| </body> | |
| </html> |
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