node

var http = require('http');
var url = require('url')
var server = http.createServer(function (req, res) {
var params = url.parse(req.url, true).query;
str = {
    id:params.id,
    name:params.name
}
var aa = JSON.stringify(str)
res.writeHeader(200, { "Content-Type": 'text/plain', 'charset': 'utf-8', 'Access-Control-Allow-Origin': '*', 'Access-Control-Allow-Methods': 'PUT,POST,GET,DELETE,OPTIONS' });
//大长串解决跨域
res.write(aa);
//返回的数据必须是string或者buffer，不然一直报错，ajax端设置为json
res.end()
}).listen(3300);

console.log('server is running at port 3300');

ajax

 get: function (url, config, callback, err) {
        let fullurl = url
        if (!!config) {
            fullurl = url + "?"
            for (let prop in config) {
                fullurl = fullurl + "&" + prop + "=" + config[prop]
            }
        }
        $.ajax({
            type: "get",
            url: fullurl,
            dataType: "json",
            success: function (data) {
                callback(data)
            },
            error: function (data) {
                if (!!err) {
                    err(data)
                }
            }
        })
    }