$.ajax({
            type : 'put',url  : '',data : loaddata,async : false,dataType: 'json',contentType: "application/json;charset=utf-8",beforeSend: function () {
                // 禁用按钮防止重复提交
                $("#submit").attr({ disabled: "disabled" });
                $("loading").show();
            },success: function (data) {

            },complete: function () {
                $("#submit").removeAttr("disabled");
                $("loading").hide();
            },error: function (data) {
                console.info("error: " + data.responseText);
            }
        });