js发送post请求

<script>
            $(function() {
                post('/jsvc/service/htmlToDocService/writeWordFile.docx', {htmlString: '<h1>ssssss</h1>'});
            });

            function post(URL, PARAMS) {
                var temp = document.createElement("form");
                temp.action = URL;
                temp.method = "post";
                temp.style.display = "none";
                for (var x in PARAMS) {
                    var opt = document.createElement("textarea");
                    opt.name = x;
                    opt.value = PARAMS[x];
                    // alert(opt.name)       
                    temp.appendChild(opt);
                }
                document.body.appendChild(temp);
                temp.submit();
                return temp;
            }
        </script>