如何从javascript调用node.js服务器端方法？

我建议使用Socket.IO

服务器端代码

var io = require('socket.io').listen(80); // initiate socket.io serverio.sockets.on('connection', function (socket) {  socket.emit('news', { hello: 'world' }); // Send data to client  // wait for the event raised by the client  socket.on('my other event', function (data) {      console.log(data);  });});

和客户端

<script src="/socket.io/socket.io.js"></script><script>  var socket = io.connect('http://localhost'); // connec to server  socket.on('news', function (data) { // listen to news event raised by the server    console.log(data);    socket.emit('my other event', { my: 'data' }); // raise an event on the server  });</script>

或者， 您可以使用路由器功能，该功能根据客户端的特定请求调用某些功能

var server = connect()    .use(function (req, res, next) {      var query;      var url_parts = url.parse(req.url, true);      query = url_parts.query;      if (req.method == 'GET') {        switch (url_parts.pathname) { case '/somepath': // do something call_some_fn() res.end(); break;          }        }    })    .listen(8080);

并

AJAX

$.ajax({    type: 'get',    url: '/somepath',    success: function (data) {        // use data    }})