详解vuex中mutationaction的传参方式
2018-09-24 21:43
前言
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nt += n; } } export default mutations;
vue组件中(省去其他代码)
methods: { add(){ //传参it(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(() => { ... }); } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。
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