NodeJS_0003：nodejs 设置允许跨域请求

1，

index.js文件中：

var http = require('http');
var express = require('express');
var router = express.Router();
var cp = require("child_process");
var nodeCmd = require('node-cmd');
var fs = require("fs");


// 允许跨域请求
router.all('*', function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Content-type,Content-Length,Authorization,Accept,X-Requested-Width");
    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");
    if (req.method == "OPTIONS") { return res.end(); };
    next();
});

// 生成机器码并写入文件
// const { machineId, machineIdSync } = require('node-machine-id');
// var macId = machineIdSync();

// fs.writeFile('../机器码.txt', '' + macId, function(err) {
//     if (err) {
//         return console.error(err);
//     }
//     console.log("数据写入成功！");
// });

// 启动本地程序
// nodeCmd.run("start D:/OPCloud/OPS/worker/OPS.exe");

router.get('/', function(req, res, next) {
    res.render('index', { title: 'XXXX' });
});

router.post('/getMacId', function(req, res) {
    res.json({ "data": macId });
});

// router.post('/down', function(req, res) {
//     cp.execFile("D:/OPCloud/OPS/language/down2.bat", null, { cwd: '' }, function(error, stdout, stderr) {
//         if (error !== null) {} else console.log("成功")
//     });
//     res.json({ "data": "downok" });
// });

module.exports = router;