限制Ajax鼠标悬停

I would like to know what's the best way to limit ajax call / time.

I'm running the following js function when the user mouseover a table row.

function load()
{
    $.ajax({
          type: "GET",
          url: "process/ajax.php",
          data: "action=action,
          success: function(msg)
                   {
                        if(msg!='')
                        {
                            displayStuff;
                        }

                   }
    });
}

Should I create a timestamp and compare it with the previous one?, How can I do that in a global context.

You can use the javascript Date Object to store the last update time, and check (against a new call to the Date Object) that upon future mouseovers.

As a suggestion, why not use the now-famous hoverIntent plugin to prevent the accidental firing of ajax calls on the mouseover event.