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我在网上下了个上传图片的js，我想上传图片的时候还提交一些参数，但是后台用request.getParameter("th");获取出来是null

function uploadSubmitHandler () {

if (state.fileBatch.length !== 0) {

var data = new FormData();

for (var i = 0; i < state.fileBatch.length; i++) {

data.append('files['+i+']', state.fileBatch[i].file, state.fileBatch[i].fileName);

}

data.append('th', $('#th option:selected').val());

data.append('uid', $('#author').val());

$.ajax({

type: 'POST',

url: options.ajaxUrl,

data: data,

cache: false,

contentType: false,

processData: false,

success: function (result) {

window.location.href = url;

},

error: function (result) {

}

});

}

}