一、创建一个Vue文件（作者选择的是vscode）

 二、更改默认加载路径，打开router目录下的index.js文件，修改为下图

修改完后代码为

import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login_ages.vue'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    name: 'Login',
    component: Login
  }
]

const router = new VueRouter({
  routes
})

export default router

 

 三、修改App.vue,如下图

修改前： 

 修改后：

代码为：

<template>
  <div id="app">
      <router-view></router-view>
  </div>
</template>

<script>
</script>

<style>
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

每次修改完都记得按CTRl+S保存

四、编写登录界面Login_ages.vue的代码，代码如下：

 

<template>
    <div class="all">
        <div class="loginpages">
            <!-- 登录页面的logo -->
            <div>
                <img src="../assets/logo.png" class="logo">
            </div>
            <!-- form表单输入框 -->
            <el-form :model="userForm" :rules="rules" ref="ruleForm" class="ruleForm">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="userForm.username" prefix-icon="el-icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="userForm.password" type="password" prefix-icon="el-icon-lock"></el-input>
                </el-form-item>
            </el-form>
            <!-- 登录与注册按钮 -->
            <div>
                <el-button type="primary" class="dl01" round @click="login">登录</el-button>
                <el-button type="success" class="zc01" round >注册</el-button>
            </div>
        </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
      userForm: {
        username: '666666',
        password: '123456'
      },
      rules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 6, 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: 12, message: '长度在 6 到 12 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    login () {
    // 外部跳转，axios
    // 判断
      if (this.userForm.username === '666666' && this.userForm.password === '123456') {
      // 登陆成功
        this.$message.success('登陆成功')
      } else {
      // 登录失败 ==>还在当前页面
        this.$message.error('登录失败')
      }
    }
  }
}

</script>

<style scoped>
.all {
    height: 100%;
    background-color: #51effa;
}

.loginpages {
    width: 450px;
    height: 300px;
    background-color: white;
    border-radius: 5px;
    position: absolute;
    top: 50%;
    left: 50%;
    /*将容器本身的长宽减去*/
    transform: translate(-50%, -50%);
}

.logo {
    height: 90px;
    margin-left: 120px;
    margin-top: 20px;
}

.ruleForm {
    margin: 0 20px;
}

.dl01 {
    position: absolute;
    left: 50%;
    transform: translate(-50%, 0);
}

.zc01 {
    position: absolute;
    left: 70%;
}</style>

五、打开终端 

点击三个点，然后点终端，然后点新建终端，然后输入命令：npm run serve   回车运行程序

如果报错可以检查一下是否安装了npm

六、运行成功后如图