项目--2

1、回顾

2、调整数据请求

utils/index.js 记录请求的 地址

export default {
  baseUrl: 'http://localhost:3000'
}

views/home/index.vue

import utils from '@/utils'
axios.get(utils.baseUrl + '/pro').then(res => {
  console.log(res)   // -----------  跨域问题
  this.prolist = res.data
})

3、解决跨域问题

3.1 使用cors解决跨域问题 --- node - day05 - app.js

3.2 使用反向代理解决跨域问题

项目根目录创建 vue.config.js

• 单个反向代理 ----- 一定要重启服务器

module.exports = {
  devServer: { // 开发服务器
    proxy: 'http://localhost:3000'
  }
}

数据请求 /pro ------》 http://localhost:3000/pro

axios.get('/pro').then(res => {
  console.log(res)
  this.prolist = res.data.data
})

修改列表组件的相关字段 components/Prolist.vue

4、点击列表进入产品的详情页面

4.1 添加详情页面，注意结构 views/detail/index.vue

<template>
  <div class="detail">
    <div class="box">
      <header class="header">详情头部</header>
      <div class="content">详情内容</div>
    </div>
    <footer class="footer">详情底部</footer>
  </div>
</template>

4.2 添加相关路由 router/index.js

{
  path: '/detail',
  name: 'detail',
  component: () => import('@/views/detail/index.vue')
}

浏览器输入 /detail，发现问题（布局问题）

4.3 解决布局问题 --- 添加.detail

html, body, .container, .detail {
  @include rect(100%, 100%); // width: 100%;height: 100%;
}
.container, .detail {}

页面有两个底部，不合理 ----- 命名视图（多视图路由）解决问题

5 命名视图（多视图路由）

5.1 抽离App.vue中的底部组件为单独的组件 components/Footer.vue

5.2 修改 router/index.js， 路由匹配多个组件

import Vue from 'vue'
import VueRouter from 'vue-router'
import Footer from '@/components/Footer'
Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/home'
  },
  { // 路由跟组件时映射关系
    path: '/home',
    name: 'home',
    // 路由的懒加载
    components: { // 一个路由 对象两个位置发生变化
      default: () => import('@/views/home/index.vue'),
      footer: Footer
    }
  },
  {
    path: '/kind',
    name: 'kind',
    // component: () => import('@/views/kind/index.vue')
    components: { // 一个路由 对象两个位置发生变化
      default: () => import('@/views/kind/index.vue'),
      footer: Footer
    }
  },
  {
    path: '/cart',
    name: 'cart',
    // component: () => import('@/views/cart/index.vue')
    components: { // 一个路由 对象两个位置发生变化
      default: () => import('@/views/cart/index.vue'),
      footer: Footer
    }
  },
  {
    path: '/user',
    name: 'user',
    // component: () => import('@/views/user/index.vue')
    components: { // 一个路由 对象两个位置发生变化
      default: () => import('@/views/user/index.vue'),
      footer: Footer
    }
  },
  {
    path: '/detail',
    name: 'detail',
    // component: () => import('@/views/detail/index.vue')
    components: { // 一个路由 对象两个位置发生变化
      default: () => import('@/views/detail/index.vue')
    }
  }
]

const router = new VueRouter({
  mode: 'history',
  base: process.env.BASE_URL,
  routes
})

export default router

5.3 App.vue 要添加 命名的视图

<template>
  <div class="container">
    <router-view></router-view>
    <router-view name="footer"></router-view>
  </div>
</template>

6、列表点击进入产品的详情

声明式跳转 + 编程式跳转（标签跳转 + js跳转(a + window.location.href="")）

6.1 声明式跳转

6.1.1 地址形如 /detail/123 ---- components/Prolist.1.vue

• 动态路由匹配传值 修改router/index.2.js

{
  path: '/detail/:proid', // *************************************
  name: 'detail',
  // component: () => import('@/views/detail/index.vue')
  components: { // 一个路由 对象两个位置发生变化
    default: () => import('@/views/detail/index.vue')
  }
}

• 列表组件通过 router-link 标签跳转 components/Prolist.vue
  :to="'/detail/' + item.proid"

:to = "{ name: 'detail', params: { proid: item.proid }}"

https://router.vuejs.org/zh/guide/essentials/named-routes.html

<template>
  <ul class="prolist">
    <router-link tag="li" :to="'/detail/' + item.proid" class="proitem" v-for="item of prolist" :key="item.proid">
      <div class="itemimg">
        <img :src="item.proimg" alt="">
      </div>
      <div class="iteminfo">
        <h2>{{ item.proname }}</h2>
        <h3>{{ item.brand }}</h3>
        <p>{{ '￥' + item.price }}</p>
      </div>
    </router-link>
  </ul>
</template>

6.1.2 地址刑如 /detail?id=123 ---- components/Prolist.3.vue

此时路由文件得重新更改 ----- router/index.js

{
  path: '/detail',
  name: 'detail',
  // component: () => import('@/views/detail/index.vue')
  components: { // 一个路由 对象两个位置发生变化
    default: () => import('@/views/detail/index.vue')
  }
}

声明式跳转

 <router-link tag="li" :to="'/detail?proid=' + item.proid" class="proitem" v-for="item of prolist" :key="item.proid" ></router-link>

6.2 编程式跳转

6.2.1 形如/detail/123 ----- components/Prolist.2.vue

• 列表添加点击事件

<li class="proitem" v-for="item of prolist" :key="item.proid" @click="toDetail(item.proid)"></li>

• 实现点击的函数

methods: {
  toDetail (proid) {
    console.log(this) // this.$router.push()
    this.$router.push('/detail/' + proid)
  }
}

拓展：路由是按照数组的形式来存储的 [{}, {}, {}]

this.$router.push() // 打开一个新的页面[{}, {}, {}, {}]

this.$router.replace() // 替换当前页面 [{}, {}, {}]

this.$router.back() // 返回上一页

this.$router.go(-1) // 返回上一页

6.2.2 形如/detail?proid=123 ---- components/Prolist.vue

• 列表添加点击事件

<li class="proitem" v-for="item of prolist" :key="item.proid" @click="toDetail(item.proid)"></li>

实现跳转

methods: {
  toDetail (proid) {
    this.$router.push('/detail?proid=' + proid)
  }
}

7、详情页面获取数据 --- 渲染数据

7.1 形如 /detail/123 获取参数---- views/detail/index.1.vue

<template>
  <div class="detail">
    <div class="box">
      <header class="header">详情头部</header>
      <div class="content">
        <img :src="proimg" alt="">
        <h1>{{ proname }}</h1>
        <h3>{{ note }}</h3>
        <p>{{ price }}</p>
        <ul>
          <li v-for="item of commentlist" :key="item.commentid">
            <h4>{{ item.username }} - {{ item.rating }}</h4>
            <p>{{ item.note }}</p>
          </li>
        </ul>
      </div>
    </div>
    <footer class="footer">详情底部</footer>
  </div>
</template>

<script>
import axios from 'axios'
export default {
  data () {
    return {
      proid: '',
      proname: '',
      proimg: '',
      price: '',
      note: '',
      commentlist: []
    }
  },
  created () {
    console.log(this.$route.params)
    const proid = this.$route.params.proid
    axios.get('/pro/detail?proid=' + proid).then(res => {
      console.log(res.data.data)
      this.proid = res.data.data.proid
      this.proname = res.data.data.proname
      this.proimg = res.data.data.proimg
      this.price = res.data.data.price
      this.note = res.data.data.note
    })
    axios.get('/comment?proid=' + proid).then(res => {
      console.log(res.data.data)
      this.commentlist = res.data.data
    })
  }
}
</script>

7.2 形如 /detail?id=123 获取参数 ---- views/detail/index.vue

相比 7.1 来说，只需要修改 this.$route.params 为 this.$route.query

8、注册功能

• views/user/index.vue 中添加如下代码

<template>
  <div class="box">
    <header class="header">个人中心头部</header>
    <div class="content">
      <div v-if="flag">
        <button>登陆</button><button>注册</button>
      </div>
      <div v-else>
        欢迎您 **** <button>退出</button>
      </div>
    </div>
  </div>
</template>
<script>
export default {
  data () {
    return {
      flag: true
    }
  }
}
</script>

8.1 添加注册页面 views/register/index.vue

<template>
  <div class="box">
    <header class="header">注册</header>
    <div class="content">
      注册
    </div>
  </div>
</template>

8.2 添加注册路由

{
  path: '/register',
  name: 'register',
  components: { // 一个路由 对象两个位置发生变化
    default: () => import('@/views/register/index.vue')
  }
}

8.3 添加注册表单

<template>
  <div class="box">
    <header class="header">注册</header>
    <div class="content">
      <input type="text" placeholder="请输入用户名" v-model="username">
      <input type="text" placeholder="请输入电话号码" v-model="tel">
      <input type="password" placeholder="请输入密码" v-model="password">
      <button class="userBtn">注册</button>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      username: '吴大勋',
      tel: '18813007814',
      password: '123456'
    }
  }
}
</script>

<style lang="scss">
input {
  outline: none;
  border: 0;
  display: block;
  width: 96%;
  margin: 5px 2%;
  border-bottom: 1px solid #efefef;
  line-height: 36px;
  text-indent: 10px;
}
.userBtn {
  outline: none;
  border: 0;
  display: block;
  background-color:#f66;
  width: 96%;
  margin: 15px 2%;
  line-height: 40px;
  font-size: 18px;
  color: #fff;
}
</style>

8.4 检验表单信息 ---- 计算属性

<template>
  <div class="box">
    <header class="header">注册</header>
    <div class="content">
      <input type="text" placeholder="请输入用户名" v-model="username">
      <p class="tip">{{ usernametip }}</p>
      <input type="text" placeholder="请输入电话号码" v-model="tel">
      <p class="tip">{{ teltip }}</p>
      <input type="password" placeholder="请输入密码" v-model="password">
      <p class="tip">{{ passwordtip }}</p>
      <button class="userBtn" @click="register">注册</button>
      {{ tip }}
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      username: '吴大勋',
      tel: '18813007814',
      password: '123456',
      tip: ''
    }
  },
  computed: {
    usernametip () {
      if (this.username === '') {
        return ''
      } else if (this.username.length < 3) {
        return '用户名格式错误'
      } else {
        return ''
      }
    },
    passwordtip () {
      if (this.password === '') {
        return ''
      } else if (this.password.length < 6) {
        return '密码格式错误'
      } else {
        return ''
      }
    },
    teltip () {
      if (this.tel === '') {
        return ''
      } else if (this.tel.length !== 11) {
        return '手机号码格式错误'
      } else {
        return ''
      }
    }
  },
  methods: {
    register () {
      if (this.username === '' || this.usernametip !== '') {
        // console.log('用户名输入不正确')
        this.tip = '请输入正确的用户名'
        return
      }
      if (this.tel === '' || this.teltip !== '') {
        this.tip = '请输入正确的手机号码'
        return
      }
      if (this.password === '' || this.passwordtip !== '') {
        this.tip = '请输入正确的密码'
        return
      }
      this.tip = ''
      console.log('可以注册了')
    }
  }
}
</script>

<style lang="scss">
input {
  outline: none;
  border: 0;
  display: block;
  width: 96%;
  margin: 5px 2%;
  border-bottom: 1px solid #efefef;
  line-height: 36px;
  text-indent: 10px;
}
.tip {
  color: #f66;
  text-align: center;
  height: 20px;
}
.userBtn {
  outline: none;
  border: 0;
  display: block;
  background-color:#f66;
  width: 96%;
  margin: 15px 2%;
  line-height: 40px;
  font-size: 18px;
  color: #fff;
}
</style>

8.5 注册功能

methods: {
    register () {
      if (this.username === '' || this.usernametip !== '') {
        // console.log('用户名输入不正确')
        this.tip = '请输入正确的用户名'
        return
      }
      if (this.tel === '' || this.teltip !== '') {
        this.tip = '请输入正确的手机号码'
        return
      }
      if (this.password === '' || this.passwordtip !== '') {
        this.tip = '请输入正确的密码'
        return
      }
      this.tip = ''
      console.log('可以注册了')
      axios.post('/users/register', {
        username: this.username,
        tel: this.tel,
        password: this.password
      }).then(res => {
        console.log(res.data)
        if (res.data.code === '10000') {
          this.tip = '该用户已注册，请直接登陆'
        } else {
          this.tip = '注册成功'
        }
      })
    }
  }