Problem with calling $(this) in jquery ajax callback function

A problem occurred when using jquery's ajax callback function, that is, $(this) cannot be used in the callback function. I have been working on this problem for a long time, but I can't solve it. Later, I saved $(this) into a variable before calling the function, and then used it in the callback function. There was no problem. I will make a note here.

$(document).ready(function(){
    $(“.del”).click(function () {
        obj=$(this).parent();//回调函数前先写入变量;
        delid=$(this).attr(‘delid’);
        $.get(‘drag.php’,{‘op’ : ‘del’,'id’ : delid},function(data){
            if(data==1){
                alert(‘删除成功’);
                obj.remove();//直接写$(this).parent()不会起作用。
            }else{
                alert(‘删除失败’);
            }
        });
    });
});