jquery获得同源iframe内body下标签的值的方法

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?123456789101112131415161718192021222324 jquery <div style="text-align:center;margin-bottom:5px;"><form action="http://www.baidu.com/baidu" target="_blank"><div bgcolor="#FFFFFF" style="text-align:center;"><input name="tn" type="hidden" value="baidu"><a href="http://www.baidu.com/"><img src="http://img.baidu.com/img/logo-80px.gif" width="80px" height="29px" alt="Baidu" align="bottom" border="0"></a><input type="text" name="word" size="30" placeholder="" value=""><input type="submit" value="baidu"></div></form></div><div id="so360" style="text-align:center;margin-bottom:5px;"><form action="https://www.so.com/" target="_blank" id="so360form"><img src="http://p1.qhimg.com/d/_onebox/search.png" width="100px" height="25px"> <input type="text" autocomplete="off" name="q" id="so360_keyword" placeholder="" value=""> <input type="submit" id="so360_submit" value="360"> <input type="hidden" name="ie" value="gbk"><input type="hidden" name="src" value="zz"> <input type="hidden" name="site" value="so.com"> <input type="hidden" name="rg" value="1"></form></div><div id="sogou" style="text-align:center;margin-bottom:5px;"><form action="https://www.sogou.com/" target="_blank" id="so360form"><img src="https://www.sogou.com/web/index/images/logo_440x140.v.4.png" width="100px" height="25px"> <input type="text" autocomplete="off" name="q" id="sogou.com_keyword" placeholder="" value=""> <input type="submit" id="sogou_submit" value="sougou"> <input type="hidden" name="ie" value="gbk"><input type="hidden" name="src" value="zz"> <input type="hidden" name="site" value="so.com"> <input type="hidden" name="rg" value="1"></form></div><div align="center"><a target="_blank" href="/sitemap.xml">map</a></div></body> </html></p> <p>login.html</p> <p>html代码</p> <p>?1234567891011121314 <!doctype html> <html> <head> <meta http-equiv=content-type content=text/html; charset=utf-8> <title>登录页面</title> <script type="text/javascript" src="/js/jquery.3.5.2.min.m.js"></script> <script 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