Vue（二十三）vuex + axios + 缓存 运用 （以登陆功能为例）

（一）axios 封装

（1）axios拦截器

可以在axios中加入加载的代码。。。

（2）封装请求

后期每个请求接口都可以写在这个里面。。。

（二）vuex

user.js

import { login } from '@/api/login'const state = {
  userInfo: null,
}const getters = {
  get_userInfo (state) {
    let userInfo = state.userInfo
    if (!userInfo) {
      userInfo = window.localStorage.getItem('userInfo')
    }
    return JSON.parse(userInfo)
  }
}const mutations = {
  set_userInfo (state, data) {
    state.userInfo = data
    window.localStorage.setItem('userInfo', state.userInfo)
  }
}const actions = {
  Login (context, {username, password}) {
    return new Promise((resolve, reject) => {
      login(username, password).then(response => {
        context.commit('set_userInfo', response.data.rtnInfo)
        resolve(response)
      }, error => {
        reject(error)
      })
    })
  }
}export default {
  state,
  getters,
  mutations,
  actions
}

（1）创建一个state – userInfo  保存用户信息

（2）getters – get_userInfo 获取用户信息，读取缓存

（3）mutations – set_userInfo  每次登录，将用户信息保存在缓存中

（4）action – Login 调用api中的login接口

进行登录操作

在index.js 中注入 user

在main.js中 引入store – index.js

（三）组件中运用

Login.Vue

<template>
  <div id="login">
    <img class="login-icon01" src="../../static/images/login02.png">
    <el-form class="login-form" :model="ruleForm" ref="ruleForm">
      <el-form-item>
        <el-input type="text" placeholder="用户名" v-model="ruleForm.username" prefix-icon="iconfont icon-user" clearable auto-complete="off"></el-input>
      </el-form-item>
      <el-form-item>
        <el-input type="password" placeholder="密码" v-model="ruleForm.password" prefix-icon="iconfont icon-password" clearable auto-complete="off"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button class="login-btn" type="primary" :loading="loading" @click="submitForm(ruleForm)">登录</el-button>
      </el-form-item>
    </el-form>
    <img class="login-icon03" src="../../static/images/login01.png">
  </div>
</template><script>
export default {
  data () {
    return {
      loading: false,
      // urlIbest: this.$store.state.User.urlIbest,
      ruleForm: {
        username: '',
        password: ''
      }
    }
  },
  methods: {
    submitForm (formName) {
      this.loading = true
      if (formName.username === '' || formName.password === '') {
        this.$message.error('用户名或密码不能为空')
        this.loading = false
      } else {
        // 登录
        this.$store.dispatch('Login', {'username': formName.username, 'password': formName.password}).then(response => {
          if (response.data && response.data.rtnCode === '00000000') {
            this.loading = false
            this.$router.push('/home')
          } else {
            this.$message.error(response.data.rtnMsg)
            this.loading = false
          }
        })
      }
    }
  }
}
</script><style lang="less" scoped>
  #login {
    background-color: #2f329f;
    position: fixed;
    top:0;
    left:0;
    right:0;
    bottom:0;
    margin:auto;
    .login-form{
      width: 80%;
      padding: 30px 10%;
      background: rgba(47,50,159,.3);
      position: absolute;
      z-index: 8;
      top: 120px;
      .el-input__inner{
        padding-top:8px;
        padding-bottom:8px;
        background-color:transparent!important;
        color:#fff;
      }
      .login-btn{
        width:100%;
        background-color:#fff;
        color:#2f329f;
        border:none;
        margin-top:20px;
      }
    }
    .login-icon01{
        position: absolute;
        width: 20%;
        right: 15%;
        top: 60px;
        z-index: 10;
    }
    .login-icon02{
        position: absolute;
        width: 50%;
        bottom:20px;
        left:0;
        right:0;
        margin:auto;
        z-index:2;
    }
    .login-icon03{
        position: absolute;
        width: 110%;
        left: 0;
        right: 0;
        bottom: 0;
        margin-left: -5%;
        z-index: 1;
    }
  }
</style>

在登录提交中，调用store中方法

this.$store.dispatch(‘Login’, {‘username’: formName.username, ‘password’: formName.password})

传入用户名和密码