1、参考

一篇文章，Vue快速入门！！！_cv展示的博客-CSDN博客_vue快速入门
Module build failed: TypeError: this.getOptions is not a function 安装node-Sass报错_Adorable_Rocy的博客-CSDN博客

2、代码

<template>
  <div>
    <el-form ref="loginForm" :model="form" :rules="rules" label-width="80px" class="login-box">
      <h3 class="login-title">欢迎登录</h3>
      <el-form-item label="账号" prop="username">
        <el-input type="text" placeholder="请输入账号" v-model="form.username"/>
      </el-form-item>
      <el-form-item label="密码" prop="password">
        <el-input type="password" placeholder="请输入密码" v-model="form.password"/>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" v-on:click="onSubmit('loginForm')">登录</el-button>
      </el-form-item>
    </el-form>

    <el-dialog title="温馨提示" :visible.sync="dialogVisible" width="30%" :before-close="handleClose">
      <span>请输入账号和密码</span>
      <span slot="footer" class="dialog-footer">
          <el-button type="primary" @click="dialogVisible = false">确定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Login",
  data() {
    return {
      form: {
        username: '',
        password: ''
      },
      //表单验证，需要在 el-form-item 元素中增加prop属性
      rules: {
        username: [
          {required: true, message: "账号不可为空", trigger: "blur"}
        ],
        password: [
          {required: true, message: "密码不可为空", tigger: "blur"}
        ]
      },

      //对话框显示和隐藏
      dialogVisible: false
    }
  },
  methods: {
    onSubmit(formName) {
      //为表单绑定验证功能
      this.$refs[formName].validate((valid) => {
        if (valid) {
          //使用vue-router路由到指定界面，该方式称为编程式导航
          this.$router.push('/main');
        } else {
          this.dialogVisible = true;
          return false;
        }
      });
    },
    handleClose: function () {
      console.log("Handle Close，空函数");
    }
  }
}
</script>

<style lang="scss" scoped>
.login-box {
  border: 1px solid #DCDFE6;
  width: 350px;
  margin: 180px auto;
  padding: 35px 35px 15px 35px;
  border-radius: 5px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  box-shadow: 0 0 25px #909399;
}

.login-title {
  text-align: center;
  margin: 0 auto 40px auto;
  color: #303133;
}
</style>