有效率吗？

I have data Json in aray. and I de-serialize in ajax. I want to change the class from element if it has class 'Booked'. is it efficient to write like this ?

$.ajax({
    url: "URL.aspx/GetData",
    type: "GET",
    contentType: "application/json; charset=utf-8",

    success: function (response) {            
        var arr = JSON.parse(response.d);           
        objData = new Array();
        objData = arr;
        for (i = 0; i < objData.length; i++) {

            if (jQuery('#' + objData[i].noSeat).hasClass('seat-booked'))
            {
                jQuery('#' + objData[i].noSeat).addClass('seat-availiable');                    
                jQuery('#class-' + objData[i].noSeat).attr('value', 'seat-availiable');
                jQuery('#' + objData[i].noSeat).removeClass('seat-booked');
                jQuery('#' + objData[i].noSeat).removeClass('selected');
            }                
        }           

I put

if

statement in

for

looping. I want to make it faster to processed. is it the best way ?

You could try for I in

for (var I in objData) {
  objData[I] // stuff
}

Edit: fixing my mistake, if only phones had autocorrect. I only meant that I think for-in loops are better than for i = 0; i < length; i++ style loops.

To make it up i'll try suggesting this untested code and downvote me if it fails :)

for (i in objData) {
    jQuery('#' + objData[i].noSeat + '.seat-booked')
        .addClass('seat-availiable')
        .removeClass('seat-booked selected')
        .closest('#class-' + objData[i].noSeat)
        .val('seat-availiable');
}

for-in looks at each element in the objData and is similar to the i=0; i<l; i++; but seems like it makes fewer assignments. the Jquery('selector') can take multiple conditions and if there's no space between the ID and the class like '#' + objData[i].noSeat + '.seat-booked', it needs both to return the object. Then all the add/remove stuff can be added to the returned object. If there's no object returned nothing else in the chain can execute, so nothing happens.