vue项目之登录功能

1.背景

在上一节的学习中我们基本上完成了登录的表单输入框界面如下:

 代码:

 <!-- 输入框-->
      <el-form  label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item >
          <el-input  prefix-icon="el-icon-s-custom"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item >
          <el-input  prefix-icon="el-icon-lock"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item >
          <el-button type="primary">登录</el-button>
          <el-button type="info">重置</el-button>
        </el-form-item>
      </el-form>

2.表单数据绑定

可以查看element的官方案例

本案例代码如下:

<div>
        <!-- 输入框-->
        <el-form :model="loginForm" label-width="0px" class="login_form">
          <!-- 用户名 -->
          <el-form-item>
            <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
          </el-form-item>
          <!-- 密码 -->
          <el-form-item>
            <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
          </el-form-item>
          <!-- 按钮区域 -->
          <el-form-item>
            <el-button type="primary">登录</el-button>
            <el-button type="info">重置</el-button>
          </el-form-item>
        </el-form>
      </div>

<script>
  export default {
    name: "Login",
    data() {
      return {
        loginForm: {
          username: 'admin',
          password: '123456'
        }
      }
    }
  }
</script>

3.表单数据格式错误提示

官方案例:

 本案例代码如下:

<template>
  <div class="login_container">
    <div class="login_box">
      <!--登录logo-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <div>
        <!-- 输入框-->
        <el-form :model="loginForm" :rules="loginRules" label-width="0px" class="login_form">
          <!-- 用户名 prop="username" 与表单验证属性对应-->
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
          </el-form-item>
          <!-- 密码 -->
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
          </el-form-item>
          <!-- 按钮区域 -->
          <el-form-item>
            <el-button type="primary">登录</el-button>
            <el-button type="info">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
  export default {
    name: "Login",
    data() {
      return {
        // 表单数据
        loginForm: {
          username: 'admin',
          password: '123456'
        },
        // 表单验证
        loginRules: {
          username: [
            // trigger: 'blur' 表示失去焦点触发
            {required: true, message: '请输入登录账号', trigger: 'blur'},
            {min: 5, max: 12, message: '长度在 6 到 12 个字符', trigger: 'blur'}
          ],
          password: [
            {required: true, message: '请输入密码', trigger: 'blur'},
            {min: 6, max: 20, message: '长度在 6 到 20 个字符', trigger: 'blur'}
          ],
        }
      }
    }
  }
</script>

<style lang="less" type="text/less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }


</style>

4.表单重置功能

官方案例如下:

 本案例代码:

<template>
  <div class="login_container">
    <div class="login_box">
      <!--登录logo-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <div>
        <!-- 输入框-->
        <el-form ref="loginFormRef" :model="loginForm" :rules="loginRules" label-width="0px" class="login_form">
          <!-- 用户名 prop="username" 与表单验证属性对应-->
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
          </el-form-item>
          <!-- 密码 -->
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
          </el-form-item>
          <!-- 按钮区域 -->
          <el-form-item>
            <el-button type="primary">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
  export default {
    name: "Login",
    data() {
      return {
        // 表单数据
        loginForm: {
          username: '',
          password: ''
        },
        // 表单验证
        loginRules: {
          username: [
            // trigger: 'blur' 表示失去焦点触发
            {required: true, message: '请输入登录账号', trigger: 'blur'},
            {min: 5, max: 12, message: '长度在 6 到 12 个字符', trigger: 'blur'}
          ],
          password: [
            {required: true, message: '请输入密码', trigger: 'blur'},
            {min: 6, max: 20, message: '长度在 6 到 20 个字符', trigger: 'blur'}
          ],
        }
      }
    },
    methods:{
      // 重置登录表单
      resetLoginForm(){
        this.$refs.loginFormRef.resetFields()
      }
    }
  }
</script>

<style lang="less" type="text/less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }


</style>

5.请求发出前数据校验

 案例代码:

      // 登录
      login() {
        // 登录前参数验证
        this.$refs.loginFormRef.validate((valid) => {
          if (!valid) {
            console.log("参数验证失败")
            return
          }
          console.log("参数校验成功")
        })
      }

6.发起登录请求

1.安装:axios(可以cnpm安装,也可以下载js引入文件)

cnpm install axios -S
-D 等价于 --save-dev
-S 等价于 --save

2.引入到vue项目中

import axios from 'axios'
axios.defaults.baseURL = 'http://127.0.0.1:XXXX/XXXXX'
Vue.prototype.$http = axios

3.发起登录请求

<template>
  <div class="login_container">
    <div class="login_box">
      <!--登录logo-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <div>
        <!-- 输入框-->
        <el-form ref="loginFormRef" :model="loginForm" :rules="loginRules" label-width="0px" class="login_form">
          <!-- 用户名 prop="username" 与表单验证属性对应-->
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
          </el-form-item>
          <!-- 密码 -->
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
          </el-form-item>
          <!-- 按钮区域 -->
          <el-form-item>
            <el-button type="primary" @click="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
  export default {
    name: "Login",
    data() {
      return {
        // 表单数据
        loginForm: {
          username: '',
          password: ''
        },
        // 表单验证
        loginRules: {
          username: [
            // trigger: 'blur' 表示失去焦点触发
            {required: true, message: '请输入登录账号', trigger: 'blur'},
            {min: 5, max: 12, message: '长度在 6 到 12 个字符', trigger: 'blur'}
          ],
          password: [
            {required: true, message: '请输入密码', trigger: 'blur'},
            {min: 6, max: 20, message: '长度在 6 到 20 个字符', trigger: 'blur'}
          ],
        }
      }
    },
    methods: {
      // 重置登录表单
      resetLoginForm() {
        this.$refs.loginFormRef.resetFields()
      },
      // 登录
      login() {
        // 登录前参数验证
        this.$refs.loginFormRef.validate(async (valid) => {
          if (!valid) {
            console.log("参数验证失败")
            return
          }
          // 发起网络请求登录
          let {data: result} = await this.$http.post('login', this.loginForm)
          console.log("result:" + result)
          if (result.meta.status !== 200) {
            console.log("登录失败")
            return
          }
          console.log("登录成功")
        })
      }
    }
  }
</script>

<style lang="less" type="text/less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }


</style>

7.消息提示配置

1.添加element 消息组件

 2.使用

8.登录成功后token存放

 // 登录
      login() {
        // 登录前参数验证
        this.$refs.loginFormRef.validate(async (valid) => {
          if (!valid) return ;
          // 发起网络请求登录
          let {data: result} = await this.$http.post('login', this.loginForm)
          console.log(result)
          if (result.meta.status !== 200){
            this.$message.error(result.meta.msg)
            return
          }
          this.$message.success("登录成功")
          // token放入 sessionStorage
          window.sessionStorage.setItem('token', result.data.token)
          // 跳转到home路径
          this.$router.push("/home")
        })
      }

9.路由导航守卫-登录拦截

 

import Vue from 'vue'
import Router from 'vue-router'
import Login from '@/components/Login'
import Home from '@/components/Home'

Vue.use(Router)

const router = new Router({
  routes: [
    {
      path: "/",
      redirect: "/login"
    },
    {
      path: '/login',
      name: 'Login',
      component: Login
    }
    ,
    {
      path: '/home',
      name: 'Home',
      component: Home
    }
  ]
})
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 从哪里跳转来的
  // next 放行

  // 判断是不是登录登录,登录路径直接放行
  if (to.path == '/login') {
    next()
    return
  }
  // 获取token,看是否有token,有token放行
  const token = window.sessionStorage.getItem("token")
  if (!token) {
    next('/login')
    return;
  }
  // 放行
  next();
})
export default router

10.退出功能

<template>
  <div>
    <el-button type="info" @click="logout">退出</el-button>
  </div>
</template>

<script>
  export default {
    name: "Home",
    methods: {
      // 退出登录
      logout() {
        window.sessionStorage.clear()
        this.$router.push("/login")
      }
    }
  }
</script>

<style lang="less" scoped>

</style>

完美!