使用Jquery判断是电脑或手机和微信浏览器访问

<script type = "text/javascript" language = "javascript" >//平台、设备和操作系统 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，如果是手机访问就自动跳转到页面 if (system.win || system.mac || system.xll || system.ipad) {alert("PC");} else {var ua = navigator.userAgent.toLowerCase(); if(ua.match(/MicroMessenger/i)=="micromessenger") { alert("微信浏览器");} else { alert("手机");} //window.location.href = "/3g/";}</script>