前端:
//动态创建script标签,并请求
function addScriptTag(src){
var script = document.createElement('script');
script.setAttribute('type', 'text/javascript');
script.src = src;
document.body.appendChild(script);
};
//如:在onload后,跨域请求
window.onload = function(){
addScriptTag('http://127.0.0.1:8080/jsonp?callback=monkey');
};
//回调的方法,且必须为全局方法,不然会报错
function monkey(data){
alert(JSON.stringify(data));
};
后端(node环境):
//引入node核心模块http
var http = require('http');
//引入url模块解析url字符串
var url = require('url');
//引入querystring模块处理query字符串
var querystring = require('querystring');
//创建新的HTTP服务器
var server = http.createServer();
//通过request事件来响应request请求
server.on('request',function(req, res){
var urlPath = url.parse(req.url).pathname;
var qs = querystring.parse(req.url.split('?')[1]);
if(urlPath === '/jsonp' && qs.callback){
res.writeHead(200,{'Content-Type':'application/json;charset=utf-8'});
var data = {
"name": "Monkey"
};
data = JSON.stringify(data);
var callback = qs.callback+'('+data+');';
res.end(callback);
}
else{
res.writeHead(200, {'Content-Type':'text/html;charset=utf-8'});
res.end('hello');
}
});
//监听8080端口
server.listen('3000');
//用于提示我们服务器启动成功
console.log('Server running!');