jquery获得同源iframe内body下标签的值的方法

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test.html

Html代码

?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 type="text/javascript" src="/js/tongji.js"></script> </head> <body> <form method="POST" action="#"> 用户名：<input id="un" type="text" name="username" value="123d" /> 密码：<input type="text" name="password"/> <input type="submit" value="提交"> </form> <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>更多信息请查看<a href="//www.reelogic.com/c2021.aspx" target="_blank">IT技术专栏</a></p> </div> <div class="c_nrgg"></div> <div class="c_nrgdd"> 更多信息请查看 <a href="//www.reelogic.com/c2025.aspx">脚本栏目</a> </div> <div class="c_nrgdd"></div> <div class="c_nrgdd"> <a href="//www.reelogic.com/memberNewsAdd.aspx">【点此处就本文及相关问题在本站进行非正式的简要咨询（便捷快速）】</a> <a href="//www.reelogic.com/n4836c56.aspx">【点此处查询各地各类考试咨询QQ号码及交流群】</a> </div> <div class="c_nrgdds"> 上一篇： <a href="//www.reelogic.com/n782731c2025.aspx">深入分析SqlServer查询计划</a> </div> <div class="c_nrgdds"> 下一篇： <a href="//www.reelogic.com/n782733c2025.aspx">用C#的params关键字实现方法形参个数可变示例</a> </div> <div class="c_nrgdds"> 手机网站地址： <a href="//www.reelogic.com/wap/n782732c2025.aspx">jquery获得同源iframe内body下标签的值的方法</a> </div> <div class="c_nrgdd"> 由于各方面情况的不断调整与变化，提供的所有考试信息和咨询回复仅供参考，敬请考生以权威部门公布的正式信息和咨询为准！ </div> <div class="c_nrtja"> <div class="c_nrtja1"> <span class="c_nrtja2">相关阅读</span> <a href="//www.reelogic.com/c2025.aspx">脚本栏目</a> </div> <div class="c_nrtja3"> <span class="c_nrtja4"><a 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