判断页面是手机访问还是电脑访问

<script type="text/javascript">
var ua = navigator.userAgent;
var isIphone = !ipad && ua.match(/(iPhone\sOS)\s([\d_]+)/),
isAndroid = ua.match(/(Android)\s+([\d.]+)/),
isMobile = isIphone || isAndroid;
if(isMobile) {
   location.herf = 'www.mobile.html';
}else{
    location.herf = 'www.pc.html';
}

//或者单独判断iphone或android 

    if(isIphone){

        //code 

    else if(isAndroid){

        //code

    }else{

        //code

    }

</script>