文件帮助中心文件
htmlTree
解析HTML树
一个htmlTree对象表示解析的HTML元素或节点。用兴趣提取部分使用Fedelement.函数或孩子们财产，并使用中提取文本extractHTMLText功能。
Fedelement.
孩子们
extractHTMLText
树= htmlTree(代码)
例子
树= htmltree（代码）解析字符串中的HTML代码代码并返回生成的树结构。
树= htmltree（代码）
树
代码
全部展开
HTML代码，指定为字符串数组，字符向量或字符向量的单元格数组。
小费
要从网页中读取HTML代码，请使用webread．
webread
从HTML文件中提取文本，使用提取物文字．
提取物文字
例子:“< a href = " //www.tianjin-qmedu.com " > MathWorks < / >”
“< a href = " //www.tianjin-qmedu.com " > MathWorks < / >”
数据类型:字符|细绳|细胞
字符
细绳
细胞
元素的直接后代，指定为一个htmlTree数组中。
父母
树中的父节点，指定为一个htmlTree目的。
如果HTML树是根节点，那么值父母是失踪．
失踪
名称
HTML元素名，指定为字符串标量。
有关更多信息，请参见HTML元素．
getAttribute.
ismissing
全部折叠
从URL读取HTML代码//www.tianjin-qmedu.com/help/textanalytics.使用webread．
//www.tianjin-qmedu.com/help/textanalytics.
url =“//www.tianjin-qmedu.com/help/textanalytics”；代码= webread (url);
使用。解析HTML代码htmlTree．
树= htmlTree(代码);
查看树的根节点的元素名。
树。名称
ans =“html”
查看根节点的子节点。
ans = 4×1 htmltree：“” 文本分析工具箱文档</ title> <meta charset =“utf-8”/> <meta content =“width = device-width，初始标度= 1.0“名称=”视口“/> <meta content =”IE = Edge“HTTP-EQUIV =”X-UA兼容“/> <链接HREF =”/包含_CONTENT /响应/ CSS / Bootstrap / Bootstrap.min.css“rel =“styleSheet”类型=“text / css”/> <link href =“/ compant_content /响应/ css / site6.css？201903”rel =“stylesh表”类型=“text / css”/> <link href =＂/includes_content/responsive/css/site6_lg.css?201903" media="screen and (min-width: 1200px)" rel="stylesheet"/><LINK href="/includes_content/responsive/css/site6_md.css?201903" media="screen and (min-width: 992px) and (max-width: 1199px)" rel="stylesheet"/><LINK href="/includes_content/responsive/css/site6_sm+xs.css?201903" media="screen and (max-width: 991px)" rel="stylesheet"/><LINK href="/includes_content/responsive/css/site6_sm.css?201903" media="screen and (min-width: 768px) and (max-width: 991px)" rel="stylesheet"/><LINK href="/includes_content/responsive/css/site6_… " " <BODY id="responsive_offcanvas"><!-- Mobile TopNav: Start --><DIV class="header visible-xs visible-sm" id="header_mobile" translate="no"><NAV class="navbar navbar-default" role="navigation"><DIV class="container-fluid"><DIV class="row"><DIV class="col-xs-12"><DIV class="navbar-header"><BUTTON class="navbar-toggle topnav_toggle" data-target="#topnav_collapse" data-toggle="collapse" type="button"><SPAN class="sr-only">Toggle Main Navigation</SPAN><SPAN class="icon-menu"/></BUTTON><A class="svg_link navbar-brand" href="//www.tianjin-qmedu.com/?s_tid=gn_logo"><IMG alt="MathWorks" class="mw_logo" src="/images/responsive/global/pic-header-mathworks-logo.svg"/></A></DIV></DIV></DIV><DIV class="row visible-xs visible-sm"><DIV class="col-xs-12"><DIV class="navbar-collapse collapse" id="topnav_collapse"><UL class="nav navbar-nav" id="topnav"><LI class="headernav_login"><A class="mwa-nav_login" href="//www.tianjin-qmedu.com/login?uri=/help/textanalytics/index.html">Sign…</pre> </div> </div> </div> <p>使用。从HTML树提取文本<code class="literal">extractHTMLText</code>．</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>str = extracthtmltext（树）</pre> </div> </div> </div> <div class="code_responsive"> <div class="programlisting"> <div class="codeoutput"> <pre>str =“Text Inalytics Toolbox™提供用于预处理，分析和建模文本数据的算法和可视化。使用工具箱创建的型号可以在情感分析，预测性维护和主题建模等应用中使用。文本分析工具箱包括用于处理的工具来自设备日志，新闻源，调查，运营商报告和社交媒体等来源的原始文本。您可以从流行的文件格式，预处理原始文本中提取文本，提取单个单词，将文本转换为数字表示，并构建统计模型。使用LSA，LDA和Word Embeddings等机器学习技术，您可以找到群集并从高维文本数据集创建功能。使用文本分析工具箱创建的功能可以与其他数据源的功能组合，以构建机器学习模型文本，数字和其他类型的数据。“</pre> </div> </div> </div> <div class="procedure"></div> </div> </div> </div> </div> <div itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/Example" itemprop="example" class="em_example"> <meta itemprop="exampleid" content="textanalytics-ParseHTMLCodeExample"> <meta itemprop="exampletitle" content="Parse HTML Code"> </div> <div class="panel-group" role="tablist" aria-multiselectable="true" id="expand_panel_heading_mw_4f3df420-61db-4225-a95a-9791ffd71431"> <div class="panel panel-default "> <div role="tab" data-toggle="collapse" id="expand_panel_heading_mw_4f3df420-61db-4225-a95a-9791ffd71431" data-target="#expand_panel_body_mw_4f3df420-61db-4225-a95a-9791ffd71431" aria-controls="expand_panel_body_mw_4f3df420-61db-4225-a95a-9791ffd71431" class="panel-heading add_cursor_pointer" aria-expanded="true"> <h3 class="panel-title" id="mw_4f3df420-61db-4225-a95a-9791ffd71431">在HTML树中查找元素<br></h3> <span class="icon-arrow-open-down icon_24"></span> <span class="icon-arrow-open-right icon_24"></span> </div> <div role="tabpanel" id="expand_panel_body_mw_4f3df420-61db-4225-a95a-9791ffd71431" aria-labelledby="expand_panel_heading_mw_4f3df420-61db-4225-a95a-9791ffd71431" class="panel-collapse collapse in"> <div class="panel-body"> <div class="examples_short_list hidden_ios_android"> <div data-pane="metadata" class="panel metadata_container panel-default"> <div class="panel-body metadata_content"> <a class="btn btn_secondary btn-block" href="matlab:openExample('textanalytics/FindElementsInHTMLTreeExample')" data-ex-genre="Live Script">打开直播脚本</a> </div> </div> </div> <p class="shortdesc">从URL读取HTML代码<code class="literal">//www.tianjin-qmedu.com/help/textanalytics.</code>使用<code class="literal">webread</code>功能。</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>url =<span style="color:#A020F0">“//www.tianjin-qmedu.com/help/textanalytics”</span>；代码= webread (url);</pre> </div> </div> </div> <p>使用。解析HTML代码<code class="literal">htmlTree</code>．</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>树= htmlTree(代码);</pre> </div> </div> </div> <p>查找使用HTML树中的所有超链接<code class="literal">Fedelement.</code>．超链接是带有元素名的节点<code class="literal">“一种”</code>．</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>选择器=<span style="color:#A020F0">“一种”</span>；子树= findElement(树,选择器);</pre> </div> </div> </div> <p>查看前几个子树。</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>子树（1:10）</pre> </div> </div> </div> <div class="code_responsive"> <div class="programlisting"> <div class="codeoutput"> <pre>ans = 10×1 htmlTree:<类= " skip_link sr-only " href = " # content_container " >跳到内容< / > < A href = " //www.tianjin-qmedu.com?s_tid=gn_logo " class = " svg_link navbar-brand”> < IMG src = " /图片/响应/全球/ pic-header-mathworks-logo.svg”类=“mw_logo”alt = " MathWorks " / > < / > < A href = " //www.tianjin-qmedu.com/pros manbetx 845ducts.html?s_tid=gn_ps " > < / > <一个产品href = " https://www.mathworks.c万博 尤文图斯om/solutions.html?s_tid=gn_sol " >解决方案< / > < A href = " //www.tianjin-qmedu.com/academia.html?s_tid=gn_acad " >学术界< / > < A href = " https://www.万博1manbetxmathworks.com/support.html?s_tid=gn_supp " >支持< / > < A href = " //www.tianjin-qmedu.com/matlabcentral/?s_tid=gn_mlc " > < / > <社区事件href = " //www.tianjin-qmedu.com/company/events.html?s_tid=gn_ev " > < / > < A href = " https://www.mathwors manbetx 845ks.com/products/get-matlab.html?s_tid=gn_getml " >得到MATLAB < / > < A href = " //www.tianjin-qmedu.com?s_tid=gn_logo " class = " svg_link pull-left”> < IMG src = " /图片/响应/全球/ pic-header-mathworks-logo.svg”类=“mw_logo”alt = " MathWorks " / > < / ></pre> </div> </div> </div> <p>使用子树中提取文本<code class="literal">extractHTMLText</code>．结果包含页面上每个链接的链接文本。</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>str = extracthtmltext（子树）;str (1:10)</pre> </div> </div> </div> <div class="code_responsive"> <div class="programlisting"> <div class="codeoutput"> <pre>ans =<span class="emphasis"><em>10×1字符串</em></span>"跳到内容" "" "产品""解决方案""学s manbetx 845术界""支持""社区"万博 尤文图斯"事件""获取MATLAB" ""万博1manbetx</pre> </div> </div> </div> <div class="procedure"></div> </div> </div> </div> </div> <div itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/Example" itemprop="example" class="em_example"> <meta itemprop="exampleid" content="textanalytics-FindElementsInHTMLTreeExample"> <meta itemprop="exampletitle" content="Find Elements in HTML Tree"> </div> <div class="panel-group" role="tablist" aria-multiselectable="true" id="expand_panel_heading_mw_d76914fb-de0f-4b89-8032-95dbd28a0773"> <div class="panel panel-default "> <div role="tab" data-toggle="collapse" id="expand_panel_heading_mw_d76914fb-de0f-4b89-8032-95dbd28a0773" data-target="#expand_panel_body_mw_d76914fb-de0f-4b89-8032-95dbd28a0773" aria-controls="expand_panel_body_mw_d76914fb-de0f-4b89-8032-95dbd28a0773" class="panel-heading add_cursor_pointer" aria-expanded="true"> <h3 class="panel-title" id="mw_d76914fb-de0f-4b89-8032-95dbd28a0773">获取HTML标记的属性<br></h3> <span class="icon-arrow-open-down icon_24"></span> <span class="icon-arrow-open-right icon_24"></span> </div> <div role="tabpanel" id="expand_panel_body_mw_d76914fb-de0f-4b89-8032-95dbd28a0773" aria-labelledby="expand_panel_heading_mw_d76914fb-de0f-4b89-8032-95dbd28a0773" class="panel-collapse collapse in"> <div class="panel-body"> <div class="examples_short_list hidden_ios_android"> <div data-pane="metadata" class="panel metadata_container panel-default"> <div class="panel-body metadata_content"> <a class="btn btn_secondary btn-block" href="matlab:openExample('textanalytics/GetAttributeOfHTMLTagExample')" data-ex-genre="Live Script">打开直播脚本</a> </div> </div> </div> <p class="shortdesc">从URL读取HTML代码<code class="literal">//www.tianjin-qmedu.com/help/textanalytics.</code>使用<code class="literal">webread</code>．</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>url =<span style="color:#A020F0">“//www.tianjin-qmedu.com/help/textanalytics”</span>；代码= webread (url);</pre> </div> </div> </div> <p>使用。解析HTML代码<code class="literal">htmlTree</code>．</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>树= htmlTree(代码);</pre> </div> </div> </div> <p>查找使用HTML树中的所有超链接<code class="literal">Fedelement.</code>．超链接是具有元素名称的节点<code class="literal">“一种”</code>．</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>选择器=<span style="color:#A020F0">“一种”</span>；子树= findElement(树,选择器);子树（1:10）</pre> </div> </div> </div> <div class="code_responsive"> <div class="programlisting"> <div class="codeoutput"> <pre>ans = 10×1 htmlTree:< class = " svg_link navbar-brand " href = " //www.tianjin-qmedu.com?s_tid=gn_logo " > < IMG alt = " MathWorks " class = " mw_logo " src = " /图片/响应全球/ pic-header-mathworks-logo.svg " / > < / > < class = " mwa-nav_login " href = " //www.tianjin-qmedu.com/login?uri=http: / / www.tianjin-qmedu.com/help/textanalytics/index.html " >在< / > <迹象产品href = " https://www.mathworkss manbetx 845.com/products.html?s_tid=gn_ps " > < / > < A href = " https://www.mathworks万博 尤文图斯.com/solutions.html?s_tid=gn_sol " >解决方案< / > < A href = " //www.tianjin-qmedu.com/academia.html?s_tid=gn_acad " >学术界< / > < A href =万博1manbetx " //www.tianjin-qmedu.com/support.html?s_tid=gn_supp " > < / > <支持社区href = " //www.tianjin-qmedu.com/matlabcentral/?s_tid=gn_mlc " > < / > < A href = " //www.tianjin-qmedu.com/company/events.html?s_tid=gn_ev " >事件< / > < A href = " //www.tianjin-qmedu.com/company/aboutus/contact_us.html?s_tid=gn_cntus " >联系我们< / > < A href = " //www.tianjin-qmedu.com/store?s_cid=store_top_nav& s_tid = gn_store " >如何购买< / ></pre> </div> </div> </div> <p>使用超级链接引用使用<code class="literal">getAttribute.</code>．指定属性名称<code class="literal">“href”</code>．</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>attr =.<span style="color:#A020F0">“href”</span>；str = getAttribute(子树,attr);str (1:10)</pre> </div> </div> </div> <div class="code_responsive"> <div class="programlisting"> <div class="codeoutput"> <pre>ans =<span class="emphasis"><em>10×1的字符串数组</em></span>“//www.tianjin-qmedu.com?s_tid=gn_logo”//www.tianjin-qmedu.com/login?uri=http：//www.tianjin-qmedu.com/help/textanalytics/index.html“https：//www.tianjin-qmedu.com/s manbetx 845products.html？s_tid = gn_ps“”//www.tianjin-qmedu.com万博 尤文图斯/solutions.html?s_tid=gn_sol“”//www.tianjin-qmedu.com/academia.html？s_tid = gn_acad“”//www.tianjin-qmedu.com万博1manbetx/support.html?s_tid=gn_supp“//www.tianjin-qmedu.com/matlabcentral/?s_tid=gn_mlc”https：//www.mathworks。com/company/events.html?s_tid=gn_ev" "//www.tianjin-qmedu.com/company/aboutus/contact_us.html?s_tid=gn_cntus" "//www.tianjin-qmedu.com/store?s_cid=store_top_nav&s_tid=gn_store"</pre> </div> </div> </div> <div class="procedure"></div> </div> </div> </div> </div> <div itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/Example" itemprop="example" class="em_example"> <meta itemprop="exampleid" content="textanalytics-GetAttributeOfHTMLTagExample"> <meta itemprop="exampletitle" content="Get Attribute of HTML Tag"> </div> <div class="panel-group" role="tablist" aria-multiselectable="true" id="expand_panel_heading_mw_eeaeb670-48b5-413c-a9d8-c6a5f261df2e"> <div class="panel panel-default "> <div role="tab" data-toggle="collapse" id="expand_panel_heading_mw_eeaeb670-48b5-413c-a9d8-c6a5f261df2e" data-target="#expand_panel_body_mw_eeaeb670-48b5-413c-a9d8-c6a5f261df2e" aria-controls="expand_panel_body_mw_eeaeb670-48b5-413c-a9d8-c6a5f261df2e" class="panel-heading add_cursor_pointer" aria-expanded="true"> <h3 class="panel-title" id="mw_eeaeb670-48b5-413c-a9d8-c6a5f261df2e">转换解析的HTML代码到字符串<br></h3> <span class="icon-arrow-open-down icon_24"></span> <span class="icon-arrow-open-right icon_24"></span> </div> <div role="tabpanel" id="expand_panel_body_mw_eeaeb670-48b5-413c-a9d8-c6a5f261df2e" aria-labelledby="expand_panel_heading_mw_eeaeb670-48b5-413c-a9d8-c6a5f261df2e" class="panel-collapse collapse in"> <div class="panel-body"> <div class="examples_short_list hidden_ios_android"> <div data-pane="metadata" class="panel metadata_container panel-default"> <div class="panel-body metadata_content"> <a class="btn btn_secondary btn-block" href="matlab:openExample('textanalytics/ConvertParsedHTMLCodeToStringExample')" data-ex-genre="Live Script">打开直播脚本</a> </div> </div> </div> <p class="shortdesc"><strong class="emphasis bold"></strong>从URL读取HTML代码<code class="literal">//www.tianjin-qmedu.com/help/textanalytics.</code>使用<code class="literal">webread</code>功能。</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>url =<span style="color:#A020F0">“//www.tianjin-qmedu.com/help/textanalytics”</span>；代码= webread (url);</pre> </div> </div> </div> <p>使用使用的HTML代码<code class="literal">htmlTree</code>功能。</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>树= htmlTree(代码);</pre> </div> </div> </div> <p>使用HTML树中的所有段落使用<code class="literal">Fedelement.</code>功能。段落是元素名称“P”的节点。</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>子树= FindElement（树，<span style="color:#A020F0">“P”</span>)；</pre> </div> </div> </div> <p>属性将子树转换为字符串<code class="literal">细绳</code>功能。</p> <div class="code_responsive"> <div class="programlisting"> <div class="codeinput"> <pre>str = string（子树）</pre> </div> </div> </div> <div class="code_responsive"> <div class="programlisting"> <div class="codeoutput"> <pre>str =<span class="emphasis"><em>26×1字符串</em></span><P class="h1">↵<A href="../index.html" class="coming_from_product">文档</A>↵< A href="../index.html" class="not_coming_from_product">帮助中心</A>↵</P>" <P>Text Analytics Toolbox™提供了用于文本数据预处理、分析和建模的算法和可视化。使用工具箱创建的模型可用于情感分析、预测维护和主题建模等应用程序。<P>文本分析工具箱包括用于处理原始文本的工具，如设备日志、新闻feeds、调查、操作员报告和社交媒体。您可以从流行的文件格式中提取文本，预处理原始文本，提取单个单词，将文本转换为数字表示，并构建统计模型。<P> " "<P>使用机器学习技术，如LSA、LDA和单词嵌入，您可以从高维文本数据集找到聚类并创建特征。使用Text Analytics Toolbox创建的功能可以与来自其他数据源的功能相结合，以构建利用文本、数字和其他类型数据的机器学习模型。< / P > " < P类=“category_desc”>学习基本的文本分析工具箱< / P > " < P类=“category_desc”>文本数据导入MATLAB <一口>®> < /晚餐和预处理分析< / P > " < P类=“category_desc”>开发预测模型使用主题模型和词嵌入的< / P > " < P类=“category_desc”>可视化文本数据和模型使用的词<P> "<P class="category_desc">文本分析工具箱中的语言支持信息</P>" <P>单击此MATLAB命令对应的链接:</P>" <P>在MATL万博1manbetxAB命令窗口中输入命令运行命令。Web浏览器不支持MATLAB命令。万博1manbetx<P> " "<P>选择一个网站来获得可用的翻译内容，并查看当地的活动和优惠。根据您的位置，我们建议您选择:<STRONG class="recommended-country"/>。</P>" "<P>You can also select a web site from the following list:</P>" "<P>Select the China site (in Chinese or English) for best site performance. 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class="procedure"></div> </div> </div> </div> </div> <div itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/Example" itemprop="example" class="em_example"> <meta itemprop="exampleid" content="textanalytics-ConvertParsedHTMLCodeToStringExample"> <meta itemprop="exampletitle" content="Convert Parsed HTML Code to String"> </div> </div> </div> <div class="moreabout ref_sect"> <h2 id="mw_734a717c-ee27-4853-9c55-cd216bed8c00">更多关于</h2> <div class="expandableContent"> <p class="switch"><a href="javascript:void(0);" class="expandAllLink">全部展开</a></p> <div class="expand_collapse"> <span id="object_htmlTree.mw_07a59a0c-4d05-4075-aa15-b3695a3381d7" class="anchor_target"></span> <h3 class="expand_trigger collapsed" id="object_htmlTree_sep_mw_07a59a0c-4d05-4075-aa15-b3695a3381d7" aria-expanded="false" data-toggle="collapse" data-target="#expand_body_object_htmlTree_sep_mw_07a59a0c-4d05-4075-aa15-b3695a3381d7" aria-controls="expand_body_object_htmlTree_sep_mw_07a59a0c-4d05-4075-aa15-b3695a3381d7"><span class="icon-arrow-open-down"></span><span class="icon-arrow-open-right"></span>HTML元素</h3> <div id="expand_body_object_htmlTree_sep_mw_07a59a0c-4d05-4075-aa15-b3695a3381d7" class="collapsible_content collapse" aria-expanded="false"> <p class="shortdesc">一个典型的HTML元素包含以下组件:</p> <div class="itemizedlist"> <ul> <li><p>元素名称 - HTML标记的名称。元素名称对应于<code class="property">名称</code>属性。</p></li> <li><p>属性 - 有关标记的其他信息。HTML属性具有表单<code class="literal"><em class="replaceable"><code>名称</code></em>= "<em class="replaceable"><code>价值</code></em>＂</code>,在那里<code class="literal"><em class="replaceable"><code>名称</code></em></code>和<code class="literal"><em class="replaceable"><code>价值</code></em></code>分别表示属性名和值。属性显示在开始的HTML标记中。要从HTML树中获取属性值，请使用<a href="//www.tianjin-qmedu.com/help/textanalytics/ref/htmltree.getattribute.html"><code class="function">getAttribute.</code></a>．</p></li> <li><p>Content—元素的内容。内容出现在打开和关闭HTML标记之间。内容可以是文本数据或嵌套的HTML元素。从…中提取文本<a href="//www.tianjin-qmedu.com/help/textanalytics/ref/htmltree.html"><code class="object">htmlTree</code></a>对象,使用<a href="//www.tianjin-qmedu.com/help/textanalytics/ref/htmltree.extracthtmltext.html"><code class="function">extractHTMLText</code></a>．对象的嵌套HTML元素<a href="//www.tianjin-qmedu.com/help/textanalytics/ref/htmltree.html"><code class="object">htmlTree</code></a>对象,使用<a href="//www.tianjin-qmedu.com/help/textanalytics/ref/htmltree.html" class="intrnllnk"><code class="property">孩子们</code></a>财产。</p></li> </ul> </div> <p></p> <p>例如，HTML元素<code class="literal"><a href="https：//www.tianjin-qmedu.com"> home </a></code>包括以下组件：</p> <div class="table-responsive"> <table class="table table-condensed"> <colgroup> <col class="tcol1" width="25%"> <col class="tcol2" width="25%"> <col class="tcol3" width="25%"> <col class="tcol4" width="25%"> </colgroup> <thead> <tr> <th colspan="2">成分</th> <th>价值</th> <th>描述</th> </tr> </thead> <tbody> <tr> <td colspan="2">元素名称</td> <td><code class="literal">一个</code></td> <td>元素是超链接</td> </tr> <tr> <td rowspan="2">属性</td> <td>属性名称</td> <td><code class="literal">href</code></td> <td>超链接引用</td> </tr> <tr> <td>属性值</td> <td><code class="literal">“//www.tianjin-qmedu.com”</code></td> <td>超链接的参考价值</td> </tr> <tr> <td colspan="2">内容</td> <td><code class="literal">家</code></td> <td>文本显示</td> </tr> </tbody> </table> </div> <p></p> </div> </div> </div> </div> <div class="ref_sect"> <h2 id="mw_2cfb6670-f2d7-4796-b7b9-73b8804c5d44">兼容性考虑因素</h2> <div class="expandableContent"> <p class="switch"><a href="javascript:void(0);" class="expandAllLink">全部展开</a></p> <div class="expand_collapse"> <h3 class="expand_trigger collapsed" id="mw_c32184ad-2188-413c-a071-cf1dffeb2624" aria-expanded="false" data-toggle="collapse" data-target="#expand_body_mw_c32184ad-2188-413c-a071-cf1dffeb2624" aria-controls="expand_body_mw_c32184ad-2188-413c-a071-cf1dffeb2624"><span class="icon-arrow-open-down"></span><span class="icon-arrow-open-right"></span><code class="object">htmlTree</code>使用不同的算法重组畸形的HTML</h3> <p class="collapsible_content"><em class="doc_incompat">R2021A中的行为发生了变化</em></p> <div id="expand_body_mw_c32184ad-2188-413c-a071-cf1dffeb2624" class="collapsible_content collapse" aria-expanded="false"> <p>在创建A.<code class="object">htmlTree</code>对象时，软件会自动重组输入的HTML代码，使其具有有效的结构。这个重组过程包括添加、删除和编辑元素以及重新排列树结构。从R2021a开始，该软件使用更新的算法来重组畸形的HTML。这种变化会导致<code class="object">htmlTree</code>与以前的版本相比，在R2021a或更高版本中创建的具有不同大小、结构和内容的对象。</p> <p>从R2021A开始加载时<code class="object">htmlTree</code>在R2020b或之前创建的MAT文件中的对象，软件会自动重组<code class="object">htmlTree</code>对象，使用与创建时相同的算法<code class="object">htmlTree</code>对象。加载时<code class="object">htmlTree</code>在R2021a或更高版本中创建的MAT文件中的<code class="object">htmlTree</code>目的。</p> <p>该表突出了改组过程中一些值得注意的步骤:</p> <div class="table-responsive"> <table class="table table-condensed"> <colgroup> <col class="tcol1" width="50%"> <col class="tcol2" width="50%"> </colgroup> <thead> <tr> <th>步</th> <th>行为的改变</th> </tr> </thead> <tbody> <tr> <td>自动添加标题和标题元素。</td> <td><p>从R2021A开始，创建一个<code class="object">htmlTree</code>对象从HTML代码，软件自动插入缺失<code class="literal"><head></code>，<code class="literal"><标题></code>和其他元素。在以前的版本中，<code class="literal">htmlTree</code>对象仅在这些元素出现在输入代码中时包含它们。</p><p>加载时<code class="object">htmlTree</code>从早期版本中创建的MAT文件的对象，软件会自动插入<code class="literal"><head></code>和<code class="literal"><标题></code>元素。加载时<code class="object">htmlTree</code>来自R2021A或更高版本的MAT文件中的对象，软件不会自动插入这些元素。</p></td> </tr> <tr> <td>自动添加缺少元素。</td> <td><p>从R2021A开始，创建一个<code class="object">htmlTree</code>对象时，当父元素和子元素不一致时，软件会自动插入缺失的元素。例如，当<code class="literal"><li></code>（列表项）元素没有父级<code class="literal"><UL></code>（无序列表）或<code class="literal">< ol ></code>(无序列表)元素，软件自动添加一个<code class="literal"><UL></code>元素以使HTML有效。与早期版本相比，这可能导致不同的输出。</p><p>加载时<code class="object">htmlTree</code>来自PAT文件的对象在早期版本中创建的，软件会自动插入缺少的元素。加载时<code class="object">htmlTree</code>来自R2021A或更高版本的MAT文件中的对象，软件不会自动插入缺失元素。</p></td> </tr> <tr> <td>丢弃符号代码的部分。</td> <td><p>在创建A.<code class="object">htmlTree</code>对象带有格式错误的HTML代码时，软件可能会丢弃部分文本。例如，如果输入代码是字符串<code class="literal">“<div> a </”</code>，然后软件丢弃文本<code class="literal">“< /”</code>．</p></td> </tr> </tbody> </table> </div> <p></p> </div> </div> </div> </div> <div class="ref_sect"> <h2 id="object_htmlTree_seealso">也可以看看</h2> <p><span itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tianjin-qmedu.com/help/textanalytics/ref/htmltree.extracthtmltext.html"><span itemprop="name"><code class="function">extractHTMLText</code></span></a></span>|<span itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tianjin-qmedu.com/help/textanalytics/ref/htmltree.findelement.html"><span itemprop="name"><code class="function">Fedelement.</code></span></a></span>|<span itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tianjin-qmedu.com/help/textanalytics/ref/htmltree.getattribute.html"><span itemprop="name"><code class="function">getAttribute.</code></span></a></span>|<span itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tianjin-qmedu.com/help/textanalytics/ref/htmltree.ismissing.html"><span itemprop="name"><code class="function">ismissing</code></span></a></span>|<span itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tianjin-qmedu.com/help/textanalytics/ref/readpdfformdata.html"><span itemprop="name"><code class="function">readpdfformdata.</code></span></a></span>|<span itemscope itemtype="//www.tianjin-qmedu.com/help/schema/MathWorksDocPage/SeeAlso" itemprop="seealso"><a itemprop="url" href="//www.tianjin-qmedu.com/help/textanalytics/ref/tokenizeddocument.html"><span itemprop="name"><code class="object">令人畏缩的鳕文</code></span></a></span></p> <div class="examples_container"> <h3 class="remove_border">话题</h3> <div itemprop="content"> <ul class="list-unstyled"> <li><a href="//www.tianjin-qmedu.com/help/textanalytics/ug/parse-html-and-extract-text-content.html" class="a">解析HTML并提取文本内容</a></li> <li><a href="//www.tianjin-qmedu.com/help/textanalytics/ug/extract-text-data-from-files.html" class="a">从文件中提取文本数据</a></li> <li><a href="//www.tianjin-qmedu.com/help/textanalytics/ug/prepare-text-data-for-analysis.html" class="a">准备分析的文本数据</a></li> <li><a href="//www.tianjin-qmedu.com/help/textanalytics/ug/create-simple-text-model-for-classification.html" class="a">为分类创建简单的文本模型</a></li> </ul> </div> </div> </div> <div class="release_introduced"> <strong>介绍了R2018b</strong> 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