随着移动端越来越重要，pc和移动端网站后台系统可能是同一个，登录或者某个特定时期需要根据不同访问来源，跳转不同页面或者做不同的处理；
这时我们就需要js的 navigator 对象；
我们先了解一下navigator 对象相关的属性：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS的navigator对象</title>
</head>
<body>
<div id="txt"></div>
<script>
var txt = "<p>浏览器代号: " + navigator.appCodeName + "</p>";
txt+= "<p>浏览器名称: " + navigator.appName + "</p>";
txt+= "<p>浏览器版本: " + navigator.appVersion + "</p>";
txt+= "<p>启用Cookies: " + navigator.cookieEnabled + "</p>";
txt+= "<p>硬件平台: " + navigator.platform + "</p>";
txt+= "<p>用户代理: " + navigator.userAgent + "</p>";
txt+= "<p>用户代理语言: " + navigator.systemLanguage + "</p>";
document.getElementById("txt").innerHTML=txt;
</script>
</body>
</html>
我们可以用其中的用户代理进行判断：
<script type="text/javascript"> var ua = navigator.userAgent; var ipad = ua.match(/(iPad).*OSs([d_]+)/), isIphone =!ipad && ua.match(/(iPhonesOS)s([d_]+)/), isAndroid = ua.match(/(Android)s+([d.]+)/), isMobile = isIphone || isAndroid; //判断 if(isMobile){ }else{ } </script>
示例二：
function check() { var userAgentInfo=navigator.userAgent; var Agents =new Array("Android","iPhone","SymbianOS","Windows Phone","iPad","iPod"); var flag=true; for(var v=0;v<Agents.length;v++) { if(userAgentInfo.indexOf(Agents[v])>0) { flag=false; break; } } return flag; }
示例三：
function() { var sUserAgent = navigator.userAgent; if (sUserAgent.indexOf('Android') > -1 || sUserAgent.indexOf('iPhone') > -1 || sUserAgent.indexOf('iPad') > -1 || sUserAgent.indexOf('iPod') > -1 || sUserAgent.indexOf('Symbian') > -1) { location.href = '要跳转的手机网址'; } else {} }
示例四：
function IsPC() { var userAgentInfo = navigator.userAgent; var Agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"]; var flag = true; for (var v = 0; v < Agents.length; v++) { if (userAgentInfo.indexOf(Agents[v]) > 0) { flag = false; break; } } return flag; } var flag = IsPC(); //true为PC端，false为手机端