JS判断手机端访问页面并跳转到指定页面

var domain = ["http://blog.csdn.net/sinat_34231050"];
var al = new Array("iPad", "iPhone", "Android", "X11", "MIDP",                    //手机型号
"Opera Mobi", "Opera Mini", "BlackBerry", "HP iPAQ", "IEMobile",
"MSIEMobile", "Windows Phone", "HTC", "LG", "MOT", "Nokia",
"Symbian", "Fennec", "Maemo", "Tear", "Midori", "armv",
"Windows CE", "WindowsCE", "Smartphone", "240x320", "176x220",
"320x320", "160x160", "webOS", "Palm", "Sagem", "Samsung", "SGH",
"Siemens", "SonyEricsson", "MMP", "UCWEB");
function toUrl() {
var i = parseInt(Math.random() * (domain.length));
window.location.href = domain[i];
}
function checkUA() {
var userAgent = navigator.userAgent;
var ifWap = "";
for ( var mobile in al) {
var m = al[mobile];
var ms = new RegExp(m.toLowerCase());
if (ms.test(userAgent.toLowerCase())) {
switch (m.toLowerCase()) {
case "ipad":
ifWap = "ipad";
toUrl();
break;
case "iphone":
ifWap = "iphone";
toUrl();
break;
default:
ifWap = "other";
toUrl();
break;
}
} else {
ifWap = "PC";
}
if (ifWap != "" && ifWap != "PC")
break;
}
}
checkUA();