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>
    <alllinks galcontinue="业务公式:新建操作|1" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="首页" />
      <page pageid="28" ns="0" title="设计表样" />
      <page pageid="159" ns="0" title="Mediawiki常用语法" />
      <page pageid="3047" ns="0" title="云表支付功能开通流程" />
    </pages>
  </query>
</api>