jquery call tab Enter key events

$(function(){
    $("input").keydown(function(){
        if(13 == event.keyCode){
            var form = $("body");
            var inputEles = form.find("input:visible");
            console.log("inputEles -> "+inputEles.length);  //5
            for(var i=0;i<inputEles.length;i++){
                if($(inputEles[i]).is($(the this ))) { // determines whether two objects are equal with jQuery IS 
                    IF (I == inputEles.length- . 1 ) { 
                        $ (inputEles [ 0 ]) Focus ();. 
                    } the else { 
                        $ (inputEles [I + . 1 ]) Focus ();. 
                    } 
                }     
            } 
        } 

    }); 
})