Master Java and use Ajax to implement cross-domain image upload function

<script type="text/JavaScript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jquery.form.js"></script>
<form id="upload-form" enctype="multipart/form-data" method="post" action="http://u01.madailvxing.cn/images/upload.php">
        <input type="file" name="pic[]">
        <input type="hidden" name="MAX_FILE_SIZE" value="10000000">
        <input type="submit" name="sub" value="上传" onclick="submitImgSize1Upload()">
     </form>
<script type="text/javascript">
function submitImgSize1Upload() {
var postData = function( form , callback){
var form = document.getElementById("upload-form");//获取表单的数据
var formdata = new FormData( form );//格式化表单数据
$.ajax({
url: “跨域的url",
type: "post",
data: formdata,  //处理表单数据
dataType: &#39;json&#39;,
processData: false,
contentType: false,
//success: function(data){
// alert(data);
// },
// error: function(data){
// console.log(data);
// }
})
$(".submit-btn").on("click",function(){
postData($(this).parents("form")[0]);
}) 
}