JS判断ipad,iphone,android的代码

<script type="text/javascript">  
var bForcepc = fGetQuery("dv") == "pc";  
function fBrowserRedirect(){  
    var sUserAgent = navigator.userAgent.toLowerCase();  
    var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";    
    var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";  
    var bIsMidp = sUserAgent.match(/midp/i) == "midp";  
    var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";  
    var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";  
    var bIsAndroid = sUserAgent.match(/android/i) == "android";  
    var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";  
    var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";  
    if(bIsIpad){  
        var sUrl = location.href;      
        if(!bForcepc){  
            window.location.href = "http://ipad.jiezo.com/";  
        }  
    }  
    if(bIsIphoneOs || bIsAndroid){  
        var sUrl = location.href;      
        if(!bForcepc){  
            window.location.href = "http://smart.jiezo.com/";  
        }  
    }  
    if(bIsMidp||bIsUc7||bIsUc||bIsCE||bIsWM){  
        var sUrl = location.href;      
        if(!bForcepc){  
            window.location.href = "http://m.jiezo.com/";  
        }  
    }  
}  
function fGetQuery(name){//获取参数值  
    var sUrl = window.location.search.substr(1);  
    var r = sUrl.match(new RegExp("(^|&)" + name + "=([^&]*)(&|$)"));  
    return (r == null ? null : unescape(r[2]));  
}  
function fShowVerBlock(){     
    if(bForcepc){  
        document.getElementById("dv_block").style.display = "block";  
    }  
    else{  
        document.getElementById("ad_block").style.display = "block";  
    }  
}  
fBrowserRedirect();  
</script>