js判断手机还是pc并跳转相关页面

<script type="text/javascript">
		function GetRequest() {
		var url = location.search; //???url??"?"????????
		var theRequest = new Object();
		if (url.indexOf("?") != -1) {
			var str = url.substr(1);
			strs = str.split("&");
			for(var i = 0; i < strs.length; i ++) {
				theRequest[strs[i].split("=")[0]] = unescape(strs[i].split("=")[1]);
			}
		}
			return theRequest;
		}

	var request = new Object();
	request = GetRequest();

	checkWidth();

    function checkWidth() {

		//if (undefined != request["Account"] && undefined != request["paihangbang"] && undefined != request["benlunmingci"] && undefined != request["tunshirenshu"] && undefined != request["benlunzuidatizhong"]) {
		//	window.location.href = "share.html"+location.search;
		//	return;
		//}

		var math = Math.floor(Math.random()*10);

		if(/AppleWebKit.*Mobile/i.test(navigator.userAgent) || (/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/.test(navigator.userAgent))){
			if(window.location.href.indexOf("?mobile")<0){
				try{
					if(/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)){
					}else if(/iPad/i.test(navigator.userAgent)){
					}else{
					}

					if(undefined != request["Account"] && undefined != request["id"])
					{
						window.location.href = "index_mobile_share.html"+location.search;
						return;
					}else{

						if(math <= 5){
							window.location.href="index_mobile.html"+location.search;
							return;
						}else{
							window.location.href="index_mobileA.html"+location.search;
							return;
						}

					}
				}catch(e){}
			}
		}else{
			if(math <= 5){
				window.location.href="index_PC.html"+location.search;
			}else{
				window.location.href="index_PCA.html"+location.search;
			}

		}
	}

	</script>