var wsSupport = require('has-cors'); require('./polling.js'); var uagent = navigator.userAgent; var isOldSimulator = ~uagent.indexOf('iPhone OS 4') || ~uagent.indexOf('iPhone OS 5'); var isAndroid = navigator.userAgent.match(/Android/i); if (wsSupport && !isOldSimulator && !isAndroid) { require ('./ws.js'); }