actions（一个oject） ---通过调用dispatch传给---> reducers（接收state和action，返回新的state） ---使用其返回值---> 改变store中的state
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<html lang="zh-CN">
<head>
<title>Document</title>
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<body>
<script src="https://unpkg.com/redux@4.0.1/dist/redux.min.js"></script>
<script>
// 1.创建action
function add(content) {
return {
type: "ADD",
content
}
}
function del(content) {
return {
type: "DEL",
content
}
}
// 2. 创建执行action的reducer
function list(state = [], action) {
switch (action.type) {
case "ADD":
return [...state, action.content];
case "DEL":
let i = state.findIndex(d => d == action.content);
if (i > -1) {
var t = [...state];
t.splice(i, 1);
return t;
} else {
return state
}
default:
return state
}
}
const testApp = Redux.combineReducers({
list
})
// 3. 根据reducer创建store
let store = Redux.createStore(testApp);
// 测试
console.log(store.getState());
store.dispatch(add(‘123‘));
store.dispatch(add(‘456‘));
store.dispatch(add(‘789‘));
console.log(store.getState());
store.dispatch(del(‘456‘));
console.log(store.getState());
</script>
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</html>原文：https://www.cnblogs.com/jffun-blog/p/10211991.html