You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages gaicontinue="001原始排序.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1027" ns="6" title="文件:0.1.jpg" />
      <page pageid="1099" ns="6" title="文件:0.1S.jpg" />
      <page pageid="1028" ns="6" title="文件:0.2.jpg" />
      <page pageid="1029" ns="6" title="文件:0.3.jpg" />
      <page pageid="1030" ns="6" title="文件:0.4.jpg" />
      <page pageid="1031" ns="6" title="文件:0.5.jpg" />
      <page pageid="1032" ns="6" title="文件:0.6.jpg" />
      <page pageid="2888" ns="6" title="文件:001传入测试数据.png" />
      <page pageid="2941" ns="6" title="文件:001修改文本长度.png" />
      <page pageid="2945" ns="6" title="文件:001创建模版.png" />
    </pages>
  </query>
</api>