在vuex中提交 mutation 是更改状态的唯一方法，并且这个过程是同步的，异步逻辑都应该封装到 action 里面。对于mutation/action，有一个常见的操作就是传参，也就是官网上说的“提交载荷”。
这里是关于如何在vue-cli中使用vuex的方法，我们采用将vuex设置分割成不同模块的方法。其中，state模块中配置如下
//vuex中的state const state = { count: 0 } export default state;
mutation传参
朴实无华的方式
mutation.js
//vuex中的mutation const mutations = { increment: (state,n) => { //n是从组件中传来的参数 state.count += n; } } export default mutations;
vue组件中（省去其他代码）
methods: { add(){ //传参 this.$store.commit('increment',5); } }
对象风格提交参数
mutation.js
//vuex中的mutation const mutations = { decrementa: (state,payload) => { state.count -= payload.amount; } } export default mutations;
vue组件
methods: { reducea(){ //对象风格传参 this.$store.commit({ type: 'decrementa', amount: 5 }); }, }
action传参
朴实无华
action.js
/vuex中的action const actions = { increment(context,args){ context.commit('increment',args); } } export default actions;
mutation.js
//vuex中的mutation const mutations = { increment: (state,n) => { state.count += n; } } export default mutations;
vue组件
methods: { adda(){ //触发action this.$store.dispatch('increment',5); } }
对象风格
action.js
//vuex中的action const actions = { decrementa(context,payload){ context.commit('decrementa',payload); } } export default actions;
mutation.js
//vuex中的mutation const mutations = { decrementa: (state,payload) => { state.count -= payload.amount; } } export default mutations;
vue组件
methods: { reduceb(){ this.$store.dispatch({ type: 'decrementa', amount: 5 }); } }
action的异步操作
突然就想总结一下action的异步操作。。。。
返回promise
action.js
//vuex中的action const actions = { asyncMul(context,payload){ //返回promise给触发的store.dispatch return new Promise((resolve,reject) => { setTimeout(() => { context.commit('multiplication',payload); resolve("async over"); },2000); }); } } export default actions;
mutation.js
//vuex中的mutation const mutations = { multiplication(state,payload){ state.count *= payload.amount; } } export default mutations;
vue组件
methods: { asyncMul(){ let amount = { type: 'asyncMul', amount: 5 } this.$store.dispatch(amount).then((result) => { console.log(result); }); } }
在另外一个 action 中组合action
action.js
//vuex中的action const actions = { asyncMul(context,payload){ //返回promise给触发的store.dispatch return new Promise((resolve,reject) => { setTimeout(() => { context.commit('multiplication',payload); resolve("async over"); },2000); }); }, actiona({dispatch,commit},payload){ return dispatch('asyncMul',payload).then(() => { commit('multiplication',payload); return "async over"; }) } } export default actions;
mutation.js
//vuex中的mutation const mutations = { multiplication(state,payload){ state.count *= payload.amount; } } export default mutations;
vue组件
methods: { actiona(){ let amount = { type: 'actiona', amount: 5 } this.$store.dispatch(amount).then((result) => { console.log(result); }); } }
使用async函数
action.js
//vuex中的action const actions = { asyncMul(context,payload){ //返回promise给触发的store.dispatch return new Promise((resolve,reject) => { setTimeout(() => { context.commit('multiplication',payload); resolve("async over"); },2000); }); }, async actionb({dispatch,commit},payload){ await dispatch('asyncMul',payload); commit('multiplication',payload); } } export default actions;
mutation.js
//vuex中的mutation const mutations = { multiplication(state,payload){ state.count *= payload.amount; } } export default mutations;
vue组件
methods: { actionb(){ let amount = { type: 'actionb', amount: 5 } this.$store.dispatch(amount).then(() => { ... }); } }