js 判断 用户浏览器所在平台

<script type="text/javascript">
          	function analysisPlatform()
          	{
	          	//平台、设备和操做系统
		        var system = {
		            win: false,
		            mac: false,
		            xll: false,
		            ipad:false
		        };
		        //检测平台
		        var p = navigator.platform;
		        system.win = p.indexOf("Win") == 0;
		        system.mac = p.indexOf("Mac") == 0;
		        system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
		        system.ipad = (navigator.userAgent.match(/iPad/i) != null)?true:false;
		        //跳转语句，若是是手机访问就自动跳转到xx页面
		        if (system.win || system.mac || system.xll||system.ipad) {
					window.location.href = "非手机端跳转";
		        } else {
		            window.location.href = "手机跳转";
		        }
          	}
          </script>