Javascript jQuery Ajax POST请求

我试图获得以下代码，通过POST将变量发送到PHP页面。我不太清楚怎么做。这是我的代码，通过GET发送数据，通过JSON编码接收数据。要通过POST将变量传递到process_parts.php，我需要做哪些更改

function imagething(){
    var done = false,
    offset = 0,
    limit = 20;
    if(!done) {
        var url = "process_parts.php?offset=" + offset + "&limit=" + limit;

        $.ajax({
            //async: false, defaults to async
            url: url
        }).done(function(response) {

            if (response.processed !== limit) {
                // asked to process 20, only processed <=19 - there aren't any more
                done = true;
            }
            offset += response.processed;
            $("#mybox").html("<span class=\"color_blue\">Processed a total of " + offset + " parts.</span>");
            alert(response.table_row);
            console.log(response);
            imagething(); //<--------------------------recursive call
        }).fail(function(jqXHR, textStatus) {

            $("#mybox").html("Error after processing " + offset + " parts. Error: " + textStatus);

            done = true;
        });
    }
}
imagething();

         $.ajax({
                    url: "URL",
                    type: "POST",
                    contentType: "application/json;charset=utf-8",
                    data: JSON.stringify(ty),
                    dataType: "json",
                    success: function (response) {
                        alert(response);
                    },

                    error: function (x, e) {
                        alert('Failed');
                        alert(x.responseText);
                        alert(x.status);
                    }
                });

函数imagething（）{
var done=false，
偏移量=0，
限值=20；
如果（！完成）{
var url=“process_parts.php？offset=“+offset+”&limit=“+limit；
$.ajax({
//async:false，默认为async
url:url
}).完成（功能（响应）{
如果（response.processed！==限制）{
//要求处理20，仅处理默认方法为
GET
，若要更改此方法，请使用
type
参数。您还可以将查询字符串属性作为对象提供，以便它们在URL中不立即可见：

var url = "process_parts.php";

$.ajax({
    url: url,
    type: 'POST',
    data: {
        offset: offset,
        limit: limit
    } 
}).done(function() {
    // rest of your code...
});

         $.ajax({
                    url: "URL",
                    type: "POST",
                    contentType: "application/json;charset=utf-8",
                    data: JSON.stringify(ty),
                    dataType: "json",
                    success: function (response) {
                        alert(response);
                    },

                    error: function (x, e) {
                        alert('Failed');
                        alert(x.responseText);
                        alert(x.status);
                    }
                });

试试这个

         $.ajax({
                    url: "URL",
                    type: "POST",
                    contentType: "application/json;charset=utf-8",
                    data: JSON.stringify(ty),
                    dataType: "json",
                    success: function (response) {
                        alert(response);
                    },

                    error: function (x, e) {
                        alert('Failed');
                        alert(x.responseText);
                        alert(x.status);
                    }
                });

一旦我添加了这些，我如何指定哪些post变量被传递到PHP？它们将在querystring中传递。我已经修改了我的答案，向您展示了如何将它们包含在post数据中。