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<h1><img src="data:image/png;base64,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">yaml语言教程<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="yaml语言教程"><a href="#yaml语言教程" class="header-anchor">#</a> yaml语言教程</h1> <h2 id="简介"><a href="#简介" class="header-anchor">#</a> 简介</h2> <p>YAML 是 &quot;YAML Ain't a Markup Language&quot;（YAML 不是一种标记语言）的递归缩写。在开发的这种语言时，YAML 的意思其实是：&quot;Yet Another Markup Language&quot;（仍是一种标记语言）。</p> <p>YAML 的语法和其他高级语言类似，并且可以简单表达清单、散列表，标量等数据形态。它使用空白符号缩进和大量依赖外观的特色，特别<strong>适合用来表达或编辑数据结构、各种配置文件、倾印调试内容、文件大纲</strong>（例如：许多电子邮件标题格式和YAML非常接近）。</p> <p>YAML 的配置文件后缀为 <strong>.yml</strong>，如：<strong>runoob.yml</strong> 。</p> <blockquote><p>yaml常用来用作配置文件，和json类似</p></blockquote> <h2 id="基本语法"><a href="#基本语法" class="header-anchor">#</a> 基本语法</h2> <ul><li><p>大小写敏感</p></li> <li><p>使用缩进表示层级关系</p></li> <li><p>缩进不允许使用tab，只允许空格</p></li> <li><p>缩进的空格数不重要，只要相同层级的元素左对齐即可</p></li> <li><p>'#'表示注释</p></li></ul> <h2 id="数据类型"><a href="#数据类型" class="header-anchor">#</a> 数据类型</h2> <p>YAML 支持以下几种数据类型：</p> <ul><li><strong>对象</strong>：键值对的集合，又称为映射（mapping）/ 哈希（hashes） / 字典（dictionary）</li> <li><strong>数组</strong>：一组按次序排列的值，又称为序列（sequence） / 列表（list）</li> <li><strong>纯量</strong>（scalars）：单个的、不可再分的值</li></ul> <h2 id="yaml-对象"><a href="#yaml-对象" class="header-anchor">#</a> YAML 对象</h2> <p>对象的几种表示形式：</p> <p>1、对象键值对使用冒号结构表示 <strong>key: value</strong>，冒号后面要加一个空格。</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">key</span><span class="token punctuation">:</span> value
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>2、也可以使用 <strong>key:{key1: value1, key2: value2, ...}</strong>。</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code>key<span class="token punctuation">:</span><span class="token punctuation">{</span>child<span class="token punctuation">-</span>key1<span class="token punctuation">:</span>value1<span class="token punctuation">,</span>child<span class="token punctuation">-</span>key2<span class="token punctuation">:</span>value2<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>3、还可以使用缩进表示层级关系；</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">key</span><span class="token punctuation">:</span> 
    <span class="token key atrule">child-key1</span><span class="token punctuation">:</span> value1
    <span class="token key atrule">child-key2</span><span class="token punctuation">:</span> value2
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>同2，只是表示形式不同。</p> <p>4、较为复杂的对象格式，可以使用问号加一个空格代表一个复杂的 key，配合一个冒号加一个空格代表一个 value：</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token punctuation">?</span>  
    <span class="token punctuation">-</span> complexkey1
    <span class="token punctuation">-</span> <span class="token key atrule">complexkey2</span>
<span class="token punctuation">:</span>
    <span class="token punctuation">-</span> complexvalue1
    <span class="token punctuation">-</span> complexvalue2
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>意思即对象的属性是一个数组 [complexkey1,complexkey2]，对应的值也是一个数组 [complexvalue1,complexvalue2]</p> <h2 id="yaml-数组"><a href="#yaml-数组" class="header-anchor">#</a> YAML 数组</h2> <p>以 <strong>-</strong> 开头的行表示构成一个数组：</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token punctuation">-</span> A
<span class="token punctuation">-</span> B
<span class="token punctuation">-</span> C
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>YAML 支持多维数组，可以使用行内表示：</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">key</span><span class="token punctuation">:</span> <span class="token punctuation">[</span>value1<span class="token punctuation">,</span> value2<span class="token punctuation">,</span> <span class="token punctuation">...</span><span class="token punctuation">]</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>数据结构的子成员是一个数组，则可以在该项下面缩进一个空格。</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token punctuation">-</span>
 <span class="token punctuation">-</span> A
 <span class="token punctuation">-</span> B
 <span class="token punctuation">-</span> C
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>一个相对复杂的例子：</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">companies</span><span class="token punctuation">:</span>
    <span class="token punctuation">-</span>
        <span class="token key atrule">id</span><span class="token punctuation">:</span> <span class="token number">1</span>
        <span class="token key atrule">name</span><span class="token punctuation">:</span> company1
        <span class="token key atrule">price</span><span class="token punctuation">:</span> 200W
    <span class="token punctuation">-</span>
        <span class="token key atrule">id</span><span class="token punctuation">:</span> <span class="token number">2</span>
        <span class="token key atrule">name</span><span class="token punctuation">:</span> company2
        <span class="token key atrule">price</span><span class="token punctuation">:</span> 500W
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>意思是 companies 属性是一个数组，每一个数组元素又是由 id、name、price 三个属性构成。</p> <p>数组也可以使用流式(flow)的方式表示：</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">companies</span><span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span><span class="token key atrule">id</span><span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span><span class="token key atrule">name</span><span class="token punctuation">:</span> company1<span class="token punctuation">,</span><span class="token key atrule">price</span><span class="token punctuation">:</span> 200W<span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token punctuation">{</span><span class="token key atrule">id</span><span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">,</span><span class="token key atrule">name</span><span class="token punctuation">:</span> company2<span class="token punctuation">,</span><span class="token key atrule">price</span><span class="token punctuation">:</span> 500W<span class="token punctuation">}</span><span class="token punctuation">]</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="复合结构-对象和数组组合"><a href="#复合结构-对象和数组组合" class="header-anchor">#</a> 复合结构（对象和数组组合）</h2> <p>数组和对象可以构成复合结构，例：</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">languages</span><span class="token punctuation">:</span>
  <span class="token punctuation">-</span> Ruby
  <span class="token punctuation">-</span> Perl
  <span class="token punctuation">-</span> Python 
<span class="token key atrule">websites</span><span class="token punctuation">:</span>
  <span class="token key atrule">YAML</span><span class="token punctuation">:</span> yaml.org 
  <span class="token key atrule">Ruby</span><span class="token punctuation">:</span> ruby<span class="token punctuation">-</span>lang.org 
  <span class="token key atrule">Python</span><span class="token punctuation">:</span> python.org 
  <span class="token key atrule">Perl</span><span class="token punctuation">:</span> use.perl.org
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>转换为 js 为：</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token punctuation">{</span> 
  <span class="token key atrule">languages</span><span class="token punctuation">:</span> <span class="token punctuation">[</span> <span class="token string">'Ruby'</span><span class="token punctuation">,</span> <span class="token string">'Perl'</span><span class="token punctuation">,</span> <span class="token string">'Python'</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
  <span class="token key atrule">websites</span><span class="token punctuation">:</span> <span class="token punctuation">{</span>
    <span class="token key atrule">YAML</span><span class="token punctuation">:</span> <span class="token string">'yaml.org'</span><span class="token punctuation">,</span>
    <span class="token key atrule">Ruby</span><span class="token punctuation">:</span> <span class="token string">'ruby-lang.org'</span><span class="token punctuation">,</span>
    <span class="token key atrule">Python</span><span class="token punctuation">:</span> <span class="token string">'python.org'</span><span class="token punctuation">,</span>
    <span class="token key atrule">Perl</span><span class="token punctuation">:</span> <span class="token string">'use.perl.org'</span> 
  <span class="token punctuation">}</span> 
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><h2 id="纯量"><a href="#纯量" class="header-anchor">#</a> 纯量</h2> <p>纯量是最基本的，不可再分的值，包括：</p> <ul><li>字符串</li> <li>布尔值</li> <li>整数</li> <li>浮点数</li> <li>Null</li> <li>时间</li> <li>日期</li></ul> <p>使用一个例子来快速了解纯量的基本使用：</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">boolean</span><span class="token punctuation">:</span> <span class="token comment"># 布尔值</span>
    <span class="token punctuation">-</span> <span class="token boolean important">TRUE</span>  <span class="token comment">#true,True都可以</span>
    <span class="token punctuation">-</span> <span class="token boolean important">FALSE</span>  <span class="token comment">#false，False都可以</span>
<span class="token key atrule">float</span><span class="token punctuation">:</span> <span class="token comment"># 浮点数</span>
    <span class="token punctuation">-</span> <span class="token number">3.14</span>
    <span class="token punctuation">-</span> <span class="token number">6.8523015e+5</span>  <span class="token comment">#可以使用科学计数法</span>
<span class="token key atrule">int</span><span class="token punctuation">:</span> <span class="token comment"># 整数</span>
    <span class="token punctuation">-</span> <span class="token number">123</span>
    <span class="token punctuation">-</span> 0b1010_0111_0100_1010_1110    <span class="token comment">#二进制表示</span>
<span class="token key atrule">null</span><span class="token punctuation">:</span> <span class="token comment"># Null</span>
    <span class="token key atrule">nodeName</span><span class="token punctuation">:</span> <span class="token string">'node'</span>
    <span class="token key atrule">parent</span><span class="token punctuation">:</span> <span class="token null important">~</span>  <span class="token comment">#使用~表示null</span>
<span class="token key atrule">string</span><span class="token punctuation">:</span> <span class="token comment"># 字符串</span>
    <span class="token punctuation">-</span> 哈哈 <span class="token comment"># 字符串默认不使用引号表示</span>
    <span class="token punctuation">-</span> <span class="token string">'Hello world'</span>  <span class="token comment">#可以使用双引号或者单引号包裹特殊字符</span>
    <span class="token punctuation">-</span> newline
      newline2    <span class="token comment">#字符串可以拆成多行，每一行会被转化成一个空格</span>
<span class="token key atrule">date</span><span class="token punctuation">:</span>
    <span class="token punctuation">-</span> <span class="token datetime number">2018-02-17</span>    <span class="token comment">#日期必须使用ISO 8601格式，即yyyy-MM-dd</span>
<span class="token key atrule">datetime</span><span class="token punctuation">:</span> 
    <span class="token punctuation">-</span>  <span class="token datetime number">2018-02-17T15:02:31+08:00</span>    <span class="token comment">#时间使用ISO 8601格式，时间和日期之间使用T连接，最后使用+代表时区</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br></div></div><p>多行字符串可以使用<code>|</code>保留换行符，也可以使用<code>&gt;</code>折叠换行。</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">this</span><span class="token punctuation">:</span> <span class="token punctuation">|</span><span class="token scalar string">
  Foo
  Bar</span>
<span class="token key atrule">that</span><span class="token punctuation">:</span> <span class="token punctuation">&gt;</span><span class="token scalar string">
  Foo
  Bar</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>转为js代码如下。</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code><span class="token punctuation">{</span> this<span class="token operator">:</span> 'Foo\nBar\n'<span class="token punctuation">,</span> that<span class="token operator">:</span> 'Foo Bar\n' <span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p><code>+</code>表示保留文字块末尾的换行，<code>-</code>表示删除字符串末尾的换行。</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">s1</span><span class="token punctuation">:</span> <span class="token punctuation">|</span><span class="token scalar string">
  Foo</span>
 
<span class="token key atrule">s2</span><span class="token punctuation">:</span> <span class="token punctuation">|</span>+
  Foo
 
 
<span class="token key atrule">s3</span><span class="token punctuation">:</span> <span class="token punctuation">|</span><span class="token punctuation">-</span>
  Foo
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>转为json代码如下</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code><span class="token punctuation">{</span> s1<span class="token operator">:</span> 'Foo\n'<span class="token punctuation">,</span> s2<span class="token operator">:</span> 'Foo\n\n\n'<span class="token punctuation">,</span> s3<span class="token operator">:</span> 'Foo' <span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>字符串之中可以插入 HTML 标记。</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">message</span><span class="token punctuation">:</span> <span class="token punctuation">|</span><span class="token scalar string">
  &lt;p style=&quot;color: red&quot;&gt;
    段落
  &lt;/p&gt;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="转换数据格式"><a href="#转换数据格式" class="header-anchor">#</a> 转换数据格式</h2> <p>允许使用两个感叹号，强制转换数据类型。</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">e</span><span class="token punctuation">:</span> <span class="token tag">!!str</span> <span class="token number">123</span>
<span class="token key atrule">f</span><span class="token punctuation">:</span> <span class="token tag">!!str</span> <span class="token boolean important">true</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>转换js结果同：</p> <div class="language-json line-numbers-mode"><pre class="language-json"><code><span class="token punctuation">{</span> e<span class="token operator">:</span> '<span class="token number">123</span>'<span class="token punctuation">,</span> f<span class="token operator">:</span> '<span class="token boolean">true</span>' <span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h2 id="锚点引用"><a href="#锚点引用" class="header-anchor">#</a> 锚点引用</h2> <p><strong>&amp;</strong> 锚点和&lt; span class=&quot;marked&quot;&gt;* 别名，可以用来引用:</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">defaults</span><span class="token punctuation">:</span> <span class="token important">&amp;defaults</span> <span class="token comment"># 添加锚点</span>
  <span class="token key atrule">adapter</span><span class="token punctuation">:</span>  postgres
  <span class="token key atrule">host</span><span class="token punctuation">:</span>     localhost

<span class="token key atrule">development</span><span class="token punctuation">:</span>
  <span class="token key atrule">database</span><span class="token punctuation">:</span> myapp_development
  <span class="token key atrule">&lt;&lt;</span><span class="token punctuation">:</span> <span class="token important">*defaults</span> <span class="token comment"># &lt;&lt;表示合并，*引用锚点</span>

<span class="token key atrule">test</span><span class="token punctuation">:</span>
  <span class="token key atrule">database</span><span class="token punctuation">:</span> myapp_test
  <span class="token key atrule">&lt;&lt;</span><span class="token punctuation">:</span> <span class="token important">*defaults</span> <span class="token comment"># &lt;&lt;表示合并，*引用锚点</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>相当于:</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token key atrule">defaults</span><span class="token punctuation">:</span>
  <span class="token key atrule">adapter</span><span class="token punctuation">:</span>  postgres
  <span class="token key atrule">host</span><span class="token punctuation">:</span>     localhost

<span class="token key atrule">development</span><span class="token punctuation">:</span>
  <span class="token key atrule">database</span><span class="token punctuation">:</span> myapp_development
  <span class="token key atrule">adapter</span><span class="token punctuation">:</span>  postgres
  <span class="token key atrule">host</span><span class="token punctuation">:</span>     localhost

<span class="token key atrule">test</span><span class="token punctuation">:</span>
  <span class="token key atrule">database</span><span class="token punctuation">:</span> myapp_test
  <span class="token key atrule">adapter</span><span class="token punctuation">:</span>  postgres
  <span class="token key atrule">host</span><span class="token punctuation">:</span>     localhost
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><p><strong>&amp;</strong> 用来建立锚点（defaults），<strong>&lt;&lt;</strong> 表示合并到当前数据，***** 用来引用锚点。</p> <p>下面是另一个例子:</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token punctuation">-</span> <span class="token important">&amp;showell</span> Steve 
<span class="token punctuation">-</span> Clark 
<span class="token punctuation">-</span> Brian 
<span class="token punctuation">-</span> Oren 
<span class="token punctuation">-</span> <span class="token important">*showell</span> 
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>转为js代码如下:</p> <div class="language-yaml line-numbers-mode"><pre class="language-yaml"><code><span class="token punctuation">[</span> <span class="token string">'Steve'</span><span class="token punctuation">,</span> <span class="token string">'Clark'</span><span class="token punctuation">,</span> <span class="token string">'Brian'</span><span class="token punctuation">,</span> <span class="token string">'Oren'</span><span class="token punctuation">,</span> <span class="token string">'Steve'</span> <span class="token punctuation">]</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><blockquote><p>参考：</p> <ul><li>yaml官网：<a href="https://yaml.org/" target="_blank" rel="noopener noreferrer">https://yaml.org/<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li> <li>yaml与js的转换demo：<a href="http://nodeca.github.io/js-yaml/" target="_blank" rel="noopener noreferrer">http://nodeca.github.io/js-yaml/<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li> <li>菜鸟教程：<a href="https://www.ruanyifeng.com/blog/2016/07/yaml.html" target="_blank" rel="noopener noreferrer">https://www.ruanyifeng.com/blog/2016/07/yaml.html<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li></ul></blockquote></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/heBody/blog/edit/master/docs/03.技术/01.技术文档/15.yaml语言教程.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2022/12/14, 19:36:42</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/blog/pages/dec4f3f00e71a312/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">npm packageJson属性详解</div></a> <a href="/blog/pages/922650/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">Git修改分支名</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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