js 判断是手机还是PC端

function getClientInfo(){
var userAgentInfo = navigator.userAgent;
var Agents = new Array("Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod");
var agentinfo = null;
for (var i = 0; i < Agents.length; i++) {
if (userAgentInfo.indexOf(Agents[i]) > 0) { agentinfo = userAgentInfo; break; }
}
if(agentinfo){
return agentinfo;
}else{
document.location.href = 'http://www.baidu.com';
}
}
getClientInfo();