easyui form submission

<form ID = " Form1 " Method = " POST " the enctype = " multipart / form-Data " > 
    <the fieldset> 
        <Legend> with Ajax submit Form form to the remote server of Api </ Legend> 
        <div class = " form-Group " > 
            <label class = " COL. 6-SM-Control-label "  for = " ds_host " > select file </ label> 
            <div class = " COL--SM. 4 ">
                <input type="file" name="file" id="inpFile" dirname="inpFile" />
            </div>
            <div class="col-sm-2">
                <input type="button" value="提交" id="inpUpload" />
            </div>
        </div>
    </fieldset>
    <script src="/plugins/jquery-3.3.1.min.js"></script>
    <script src=" /Plugins/easyui/jquery.easyui.min.js " > </ Script> 
    <Script> 
        $ (Document) .ready (function () { 
            $ ( " #inpUpload " ) .click (function () {
                 var fileObj = $ ( " #inpFile " .) GET ( 0 ) .files [ 0 ];
                 IF (fileObj == null ) { 
                    Alert ( " Please select a file to upload " );
                     return  false ; 
                }
                $ ( "#form1").form("submit", {
                    url: "http://localhost:19501/Files/ReceiveFileTest",
                    onSubmit: function (params) {
                        //提交前检查
                        return true;
                    },
                    success: function (data) {
                        console.log(data);
                        var data = eval('(' + data + ')');
                        alert(JSON.stringify(data));
                    }
                });
            });
        });
    </script>
</form>