nodejs搭建后端+解决跨域问题

2、全局安装express-generator：
npm install express-generator -g

3、使用express创建工程
express --view=pug 工程名

4、进入工程目录

6、npm install

7、启动工程测试
npm start

跨域问题

app.js加入以下代码

//设置跨域访问 
app.all(‘*‘, function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    // res.header("Access-Control-Allow-Headers", "X-Requested-With");
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
    // res.header("X-Powered-By",‘ 3.2.1‘)
    res.header("Content-Type", "application/json;charset=utf-8");
    next();
});

路由代码可能需要改一下，如果请求头的Content-type设置为application/json

res.render 改为res.json

前端代码

import * as http from "http";
import * as querystring from ‘querystring‘;
export class NetWorkRequest {

    public static sendRequest(userCode: string) {

        var userId = userCode;
        var post_data = { userId: userId }
        var contents = querystring.stringify(post_data);

        var options = {
            hostname: "localhost",
            port: 3000, 
            path: "?" + contents,
            method: "POST",
            rejectUnauthorized: false

        };
        var req = http.request(options, function (res) {
            res.setEncoding(‘utf-8‘);
            res.on("data", function (d) {
                console.log("服务器返回数据：" + d)

            });

        });
        req.on("error", function (e) {

        });
        req.end();
    }

}

nodejs搭建后端+解决跨域问题

原文：https://blog.51cto.com/11020803/2529735