Why does jQuery remove body and head tags when populating an iframe with a style tag but not without?

前端未结
关注
 2  1267
后悔当初 2021-02-16 00:23
If I run the following code, the body and head tags are removed.

    <html>
    <head>
        <style type=\"text         
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-5408099190056760"
     data-ad-slot="7305827575"
     data-ad-format="auto"
     data-full-width-responsive="true"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>        </div>
      </div>
      
      <div class="fly-panel detail-box" id="flyReply">
        <fieldset class="layui-elem-field layui-field-title" style="text-align: center;">
          <legend>2条回答</legend>        </fieldset>

        <ul class="jieda" id="jieda">
                    <li data-id="111" class="jieda-daan">
            <a name="item-1111111111"></a>
            <div class="detail-about detail-about-reply">
                         <a class="fly-avatar" href="">
                <img src="https://www.e-learn.cn/qa/data/avatar/000/00/00/small_000000094.jpg" alt=" 一整个雨季 ">
              </a>
              <div class="fly-detail-user">
                <a href="" class="fly-link">
                  <cite> 一整个雨季</cite>
                                             
                </a>
                
                <span>(楼主)</span>
            
              </div>              <div class="detail-hits">
                <span>2021-02-16 00:40</span>
              </div>

            </div>
            <div class="detail-body jieda-body photos">
              <p>          
<p>I had the same issue and learned from this SO question that in fact it's the browser that does the stripping, as part of its parsing of the <code>innerHTML</code> property, which is what <code>jQuery</code> uses internally in <code>.html()</code>.</p>

<p>Rather, the problem is actually that <code>jQuery</code> uses an intermediate new DIV, which I believe is not allowed to contain certain tags, resulting in the stripping.</p>

<p>To the solution, then. It's as simple as setting the <code>innerHTML</code> property of the <code>html</code> element directly, like so:</p>

<pre><code>// This forcibly removes head, body, and other tags, since it internally uses an empty DIV and its innerHTML property
jQuery(targetElement).html(exitHtml);

// This works fine
h = document.getElementsByTagName('html')[0];
h.innerHTML = htmlString;
</code></pre>

<p>For your particular case, simply target the <code>html</code> element <strong>inside</strong> the <code>iframe</code>.
Your final code might be:</p>

<pre><code><script>
    $('iframe').load(function () {
        var contents = $('iframe').text();
        iframeHtml = $('iframe').contents().find('html').get(0);
        iframeHtml.innerHTML = contents;
    });
</script>
</code></pre>
    </p>
             <div class="appendcontent">
                                                        </div>
            </div>
            <div class="jieda-reply">
              <span class="jieda-zan button_agree" type="zan" data-id='2216033'>
                <i class="iconfont icon-zan"></i>
                <em>0</em>
              </span>
                   <span type="reply" class="showpinglun" data-id="2216033">
                <i class="iconfont icon-svgmoban53"></i>
               讨论(0)
              </span>
                                                  
              
              <div class="jieda-admin">
                          
             
       
          
              </div>
                                       <div class="noreplaytext bb">
<center><div>   <a href="https://www.e-learn.cn/qa/q-1137037.html">  查看其它2个回答
</a>
</div></center>
</div>            </div>
                         <div class="comments-mod "  style="display: none; float:none;padding-top:10px;" id="comment_2216033">
                    <div class="areabox clearfix">

<form class="layui-form" action="">
               
            <div class="layui-form-item">
    <label class="layui-form-label" style="padding-left:0px;width:60px;">发布评论:</label>
    <div class="layui-input-block" style="margin-left:90px;">
         <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" />
                        <input type='hidden' value='0' name='replyauthor' />
    </div>
    <div class="mar-t10"><span class="fr layui-btn layui-btn-sm addhuidapinglun" data-id="2216033">提交评论 </span></div>
  </div>
  
</form>
                    </div>
                    <hr>
                    <ul class="my-comments-list nav">
                        <li class="loading">
                        <img src='https://www.e-learn.cn/qa/static/css/default/loading.gif' align='absmiddle' />
                        &nbsp;加载中...
                        </li>
                    </ul>
                </div>
          </li>
                              			
        </ul>
        
        <div class="layui-form layui-form-pane">
          <form id="huidaform"  name="answerForm"  method="post">
            
            <div class="layui-form-item layui-form-text">
              <a name="comment"></a>
              <div class="layui-input-block">
            
    
<script type="text/javascript" src="https://www.e-learn.cn/qa/static/js/neweditor/ueditor.config.js"></script>
<script type="text/javascript" src="https://www.e-learn.cn/qa/static/js/neweditor/ueditor.all.js"></script>
<script type="text/plain" id="editor"  name="content"  style="width:100%;height:200px;"></script>                                 
<script type="text/javascript">
                                 var isueditor=1;
            var editor = UE.getEditor('editor',{
                //这里可以选择自己需要的工具按钮名称,此处仅选择如下五个
                toolbars:[['source','fullscreen',  '|', 'undo', 'redo', '|', 'bold', 'italic', 'underline', 'fontborder', 'strikethrough', 'removeformat', 'formatmatch', 'autotypeset', 'blockquote', 'pasteplain', '|', 'forecolor', 'backcolor', 'insertorderedlist', 'insertunorderedlist', 'selectall', 'cleardoc', '|', 'rowspacingtop', 'rowspacingbottom', 'lineheight', '|', 'customstyle', 'paragraph', 'fontfamily', 'fontsize', '|', 'indent', '|', 'justifyleft', 'justifycenter', 'justifyright', 'justifyjustify', '|', 'link', 'unlink', 'anchor', '|', 'simpleupload', 'insertimage', 'scrawl', 'insertvideo', 'attachment', 'map', 'insertcode', '|', 'horizontal', '|', 'preview', 'searchreplace', 'drafts']],
            
                initialContent:'',
                //关闭字数统计
                wordCount:false,
                zIndex:2,
                //关闭elementPath
                elementPathEnabled:false,
                //默认的编辑区域高度
                initialFrameHeight:250
                //更多其他参数，请参考ueditor.config.js中的配置项
                //更多其他参数，请参考ueditor.config.js中的配置项
            });
                        editor.ready(function() {
            	editor.setDisabled();
            	});
                            $("#editor").find("*").css("max-width","362px");
        </script>              </div>
            </div>
                          
    

        
         <div class="layui-form-item">
                <label for="L_vercode" class="layui-form-label">验证码</label>
                <div class="layui-input-inline">
                  <input type="text"  id="code" name="code"   value="" required lay-verify="required" placeholder="图片验证码" autocomplete="off" class="layui-input">
                </div>
                <div class="layui-form-mid">
                  <span style="color: #c00;"><img class="hand" src="https://www.e-learn.cn/qa/user/code.html" onclick="javascript:updatecode();" id="verifycode"><a class="changecode"  href="javascript:updatecode();">&nbsp;看不清?</a></span>
                </div>
              </div>
                                  <div class="layui-form-item">
                    <input type="hidden" value="1137037" id="ans_qid" name="qid">
   <input type="hidden" id="tokenkey" name="tokenkey" value=''/>
                <input type="hidden" value="Why does jQuery remove body and head tags when populating an iframe with a style tag but not without?" id="ans_title" name="title"> 
             
              <div class="layui-btn    layui-btn-disabled"  id="ajaxsubmitasnwer" >提交回复</div>
            </div>
          </form>
        </div>
      </div>
      <input type="hidden" value="1137037" id="adopt_qid"	name="qid" /> 
      <input type="hidden" id="adopt_answer" value="0"	name="aid" />
    </div>
    <div class="layui-col-md4">
          
 <!-- 热门讨论问题 -->
     
 <dl class="fly-panel fly-list-one">
        <dt class="fly-panel-title">热议问题</dt>
            <!-- 本周热门讨论问题显示10条-->