let connect = require('connect'),         // 引入connect模塊
    bodyParser = require('body-parser'),  // 引入body-parser解析模塊
    nodemailer = require('nodemailer');   // 引入nodemailer模塊

async function sendMail(text,receive) {
	let user = "703669046@qq.com";//自己的郵箱
	let pass = "sfsdfsdfsggxcew"; //qq郵箱授權碼
	let to = `${receive}@qq.com`; //對方的郵箱
	let transporter = nodemailer.createTransport({
		host: "smtp.qq.com",
		port: 587,
		secure: false,
		auth: {
			user: user, // 用戶賬號
			pass: pass, //授權碼,通過QQ獲取
		},
	});
	let info = await transporter.sendMail({
		from: `測試node發(fā)送郵箱<${user}>驗證碼`, // sender address
		to: `測試驗證碼<${to}>`, // list of receivers
		subject: "測試驗證碼", // Subject line
		text: text, // plain text body
	});
}

var app = connect()
	.use(bodyParser.json())   //JSON解析
	.use(bodyParser.urlencoded({ extended: true }))
	//use()方法還有一個可選的路徑字符串，對傳入請求的URL的開始匹配。
	//use方法來維護一個中間件隊列

	.use(function (req, res, next) {
		//跨域處理
		// Website you wish to allow to connect
		res.setHeader('Access-Control-Allow-Origin', '*');  //允許任何源
		// Request methods you wish to allow
		res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');  //允許任何方法
		// Request headers you wish to allow
		res.setHeader('Access-Control-Allow-Headers', '*');   //允許任何類型
		res.writeHead(200, { "Content-Type": "text/plain;charset=utf-8" });    //utf-8轉碼
		next();  //next 方法就是一個遞歸調用
	})

	.use('/emails', function (req, res, next) {
		let qqEmail= req.body.email;
		var obj = {
			code:Math.ceil(Math.random()*1000)
		};
		let text=`驗證碼：${obj.code}.您正在使用登錄功能，驗證碼提供他人可能導致賬號被盜，請勿轉發(fā)或泄漏`
		sendMail(text,qqEmail)
		res.end(JSON.stringify(obj))
		next();
	})

.listen(3331);

<template>
    <div>
        <el-form
            :model="ruleForm"
            status-icon
            ref="ruleForm"
            label-width="100px"
            class="demo-ruleForm"
        >
            <el-form-item label="QQ" prop="email">
                <el-input type="email" v-model="ruleForm.email" autocomplete="off"></el-input>
                <el-button @click="handleCode">獲取驗證碼</el-button>
            </el-form-item>
            <el-form-item label="驗證碼" prop="code">
                <el-input v-model.number="ruleForm.code"></el-input>
            </el-form-item>
            <el-form-item>
                <el-button type="primary" @click="submitForm('ruleForm')">提交</el-button>
                <el-button @click="resetForm('ruleForm')">重置</el-button>
            </el-form-item>
        </el-form>
    </div>
</template>

import ajax from '../../utli/request'

export const getCheckCode = param => ajax.$post('/emails', param || {});

<script>
import {getCheckCode} from './api/form'
export default {
    data() {
        return {
            ruleForm: {
                email: "",
                checkPass: "",
                code: ""
            },
        };
    },
    methods: {
        submitForm(formName) {
            this.$refs[formName].validate(valid => {
                if (valid) {
                    alert("submit!");
                } else {
                    console.log("error submit!!");
                    return false;
                }
            });
        },
        resetForm(formName) {
            this.$refs[formName].resetFields();
        },
        async handleCode(){
            let params= {
                email:this.ruleForm.email
            }
            let res = await getCheckCode(params);
            if(res.state==200){
                console.log(res)
            }
        }
    }
};
</script>