区分PC还是移动设备useragent的javascript代码

判断useragent是来自普通pc，还是来自移动设备。普通pc打开index-pc.html，移动设备打开index-m.html 

var deviceAgent = navigator.userAgent.toLowerCase();var agentID = deviceAgent.match(/(iphone|ipod|ipad|android)/);if(agentID){if(agentID.indexOf("iphone")>=0 || agentID.indexOf("ipod")>=0 || agentID.indexOf("ipad")>=0 || agentID.indexOf("android")>=0){window.location="index-m.html";}else{window.location="index-pc.html";}}else{window.location="index-pc.html";}