使用office js word api在word中插入内容控件

以下是我的代码:-

Word.run(function (context) {


            var body = context.document.body;
            var contents = body.contentControls;
            // Queue a commmand to wrap the body in a content control.
            var a = body.insertContentControl();
            a.appearance = "name";
            a.tag = "name1";
            a.title = "name";


            return context.sync().then(function () {
               // context.load(body);
                console.log('Wrapped the body in a content control.');
            });
        })
        .catch(function (error) {

            console.log('Error: ' + JSON.stringify(error));
            if (error instanceof OfficeExtension.Error) {
                console.log('Debug info: ' + JSON.stringify(error.debugInfo));
            }
        });

此外,我想添加属性,如外观,标签,标题的新内容控制创建