客戶端程式碼（client.html）：
var socket = io.connect('localhost:80');
服務(wù)端（server.js）：
io = require('socket.io').listen("80",{origins:'*'});
在本機可以正常運行，放到本機伺服器，提示
#XMLHttpRequest cannot load http://localhost/socket.io/?E... No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://jess. dev' is therefore not allowed access. The response had HTTP status code 404.
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