所以，这里是工作代码.显然，当我们插入文本时，返回了一个新的范围，我们需要使用该范围来插入书签.

So, here is the working code. Apparently, when we insertText, a new range is returned, we need to use that range to insertBookmark.

Word.run(function (context)
{
    let range = context.document.getSelection();
    return context.sync().then(function ()
    {
        let insertedTextRange = range.insertText(`Test Bookmark`, Word.InsertLocation.replace);

        let uniqueStr = new Date().getTime();
        let bookmarkName = `Test_BookmarkCode_${uniqueStr}`;
        insertedTextRange.insertBookmark(bookmarkName);
    });
});