sharejs 0.6 with express4

use sharejs 0.6 with express, always get erro... the sharejs cannot be correct loaded on client side, it comes out:

Resource interpreted as Script but transferred with MIME type text/html: "http://localhost:3000/channel/bcsocket.js". localhost/:170
Resource interpreted as Script but transferred with MIME type text/html: "http://localhost:3000/share/textarea.js". localhost/:172
Resource interpreted as Script but transferred with MIME type text/html: "http://localhost:3000/share/share.js". localhost/:171
Uncaught SyntaxError: Unexpected token < bcsocket.js:1
Uncaught SyntaxError: Unexpected token < share.js:1
Uncaught SyntaxError: Unexpected token < textarea.js:1
Uncaught ReferenceError: sharejs is not defined (index):18

my client side is like the demo in the get started doc

and server side：

var sharejs = require('share').server;
var options = {db: {type: 'none'}};

var app = express();

......

var server = http.createServer(app);

sharejs.attach(app, options);

server.listen(app.get('port'), function () {
console.log('Express server listening on port ' + app.get('port'));
});