vue技术栈开发实战--学习笔记1

课程

vue技术栈开发实战

https://segmentfault.com/ls/1650000016221751

iview-admin作者 Lison 出品

个人学习笔记1-7

1 vue-cli 3.0

npm install -g cnpm --registry=https://registry.npm.taobao.org
cnpm install -g @vue/cli

2 路由

path: '/argu/:name',
alias: '/home_page',
name: 'argu',
components: {
    default: () => import('@/views/child.vue'),
    email: () => import('@/views/email.vue'),  // 多个组件
    tel: () => import('@/views/tel.vue')
},
meta: {
    title: 'home'
},
children: []

redirect: to => '/'  //重定向





{{ $route.params.name }}

this.$router.push({
    name: `argu`,
    params: {
        name: 'lison'
    },
    query:{}
    path:`/argu/${names}`
})

3 路由

{
  path: '/argu/:name',
  name: 'argu',
  component: () => import('@/views/argu.vue'),
  props: true

  props: {
    food: 'banana'  //第二种
  },
  props: route => ({  //第三种
    food: route.query.food
  }),
},

{{ food }}

export default {
  props: {
   food : {
      type: String,
      default: 'lison'
    }
  },
  beforeRouteEnter (to, from, next) {
    next(vm => {
      console.log(vm)
    })
  },
   beforeRouteLeave (to, from, next) {
       // const leave = confirm('您确定要离开吗？')
       // if (leave) next()
       // else next(false)
       next()
  },
  beforeRouteUpdate (to, from, next) {
    console.log(to.name, from.name)
  }
}

export const setTitle = (title) => {
    window.document.title = title || 'admin'
}

const HAS_LOGINED = true

router.beforeEach((to, from, next) => {
  to.meta && setTitle(to.meta.title)
  if (to.name !== 'login') {
    if (HAS_LOGINED) next()
    else next({ name: 'login' })
  } else {
    if (HAS_LOGINED) next({ name: 'home' })
    else next()
  }
})

1. 导航被触发
2. 在失活的组件（即将离开的页面组件）里调用离开守卫 beforeRouteLeave
3. 调用全局的前置守卫 beforeEach
4. 在重用的组件里调用 beforeRouteUpdate
5. 调用路由独享的守卫 beforeEnter
6. 解析异步路由组件
7. 在被激活的组件（即将进入的页面组件）里调用 beforeRouteEnter
8. 调用全局的解析守卫 beforeResolve
9. 导航被确认
10. 调用全局的后置守卫 afterEach
11. 触发DOM更新
12. 用创建好的实例调用beforeRouterEnter守卫里传给next的回调函数

4 bus
父子组件    单向数据量                  父到子   属性              子修改 事件修改

  // 子组件

handleInput (event) {
  const value = event.target.value
  this.$emit('input', value)
}

   //父组件


components: {
  AInput,
  AShow
},
methods: {
  handleInput (val) {   //获取 
    this.inputValue = val
  }
}

兄弟组件

import Vue from 'vue'
const Bus = new Vue()
export default Bus

import Bus from './lib/bus'

Vue.config.productionTip = false
Vue.prototype.$bus = Bus

methods: {
  handleClick () {
    this.$bus.$emit('on-click', 'hello')
  }
}

mounted () {
  this.$bus.$on('on-click', mes => {
    this.message = mes
  })
}

5 vuex-- setter getter

const state = {
  appName: 'admin'
}
const getters = {
    appNameWithVersion: (state) => {
        return `${state.appName}v2.0`
}
}

const getters = {
    firstLetter: (state) => {
        return state.userName.substr(0, 1)
    }
}

export default state

import { mapState, mapGetters } from 'vuex'
computed: {
appName () {
  return this.$store.state.appName
},
...mapState({
  userName: state => state.user.userName
}),
...mapGetters([
  'appNameWithVersion',
  'firstLetter'
]),
}

6 vuex-mutation_action_module

const mutations = {            // 修改store值
  SET_APP_NAME (state, params) {
    state.appName = params
  },
  SET_APP_VERSION (state) {
vue.set(state, 'appVersion', 'v2.0')
  }
}
import { mapState, mapGetters, mapMutations, mapActions } from 'vuex'
methods: {
  ...mapMutations([
    'SET_USER_NAME',
    'SET_APP_NAME'
  ]),
  ...mapActions([
    'updateAppName'
  ])，
handleChangeAppName () {
  // this.$store.commit({
  //   type: 'SET_APP_NAME',
  //   appName: 'newAppName'
  // })
this.SET_APP_NAME({
    appName: 'newAppName'
})
}

const actions = {
  // updateAppName ({ commit }) {
  //   getAppName().then(res => {
  //     const { info: { appName } } = res
  //     commit('SET_APP_NAME', appName)
  //   }).catch(err => {
  //     console.log(err)
  //   })
  // }
  async updateAppName ({ commit }) {
    try {
      const { info: { appName } } = await getAppName()
      commit('SET_APP_NAME', appName)
    } catch (err) {
      console.log(err)
    }
  }
}

...mapActions([
  'updateAppName'
]),

7 vuex进阶   
持久化存储

store

export default store => {
  if (localStorage.state) store.replaceState(JSON.parse(localStorage.state))
  store.subscribe((mutation, state) => {
    localStorage.state = JSON.stringify(state)
  })
}

import saveInLocal from './plugin/saveInLocal'
plugins: [ saveInLocal ]

strict 严格模式



SET_STATE_VALUE (state, value) {
  state.stateValue = value
}

stateValue: {
  get () {
    return this.$store.state.stateValue
  },
  set (val) {
    this.SET_STATE_VALUE(val)
  }
},