手机跳转

<script>
var ua = navigator.userAgent;
var ipad = ua.match(/(iPad).*OS\s([\d_]+)/),
    isIphone = !ipad && ua.match(/(iPhone\sOS)\s([\d_]+)/),
    isAndroid = ua.match(/(Android)\s+([\d.]+)/),
    isMobile = isIphone || isAndroid;
    if(isMobile) {
          document.write("<h1 style=' font-size:40px;'>正在跳转至手机版，请稍后！</h1>");
        location.href = '/wap';
    }else{
        //location.href = 'http://www.domain.com';
     }
    //或者单独判断iphone或android
    if(isIphone){
        //code
     }else if(isAndroid){
        //code
    }else{
        //code
    }
</script>