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class="content-wrapper"><!----> <h1><img 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 <div class="theme-vdoing-content content__default"><h1 id="比typeof运算符更准确的类型判断"><a href="#比typeof运算符更准确的类型判断" class="header-anchor">#</a> 比typeof运算符更准确的类型判断</h1> <p>不同数据类型的<code>Object.prototype.toString</code>方法返回值如下。</p> <ul><li>数值：返回<code>[object Number]</code>。</li> <li>字符串：返回<code>[object String]</code>。</li> <li>布尔值：返回<code>[object Boolean]</code>。</li> <li>undefined：返回<code>[object Undefined]</code>。</li> <li>null：返回<code>[object Null]</code>。</li> <li>数组：返回<code>[object Array]</code>。</li> <li>arguments 对象：返回<code>[object Arguments]</code>。</li> <li>函数：返回<code>[object Function]</code>。</li> <li>Error 对象：返回<code>[object Error]</code>。</li> <li>Date 对象：返回<code>[object Date]</code>。</li> <li>RegExp 对象：返回<code>[object RegExp]</code>。</li> <li>其他对象：返回<code>[object Object]</code>。</li></ul> <p>这就是说，<code>Object.prototype.toString</code>可以看出一个值到底是什么类型。</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span> <span class="token comment">// &quot;[object Number]&quot;</span>
<span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span> <span class="token comment">// &quot;[object String]&quot;</span>
<span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span> <span class="token comment">// &quot;[object Boolean]&quot;</span>
<span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">undefined</span><span class="token punctuation">)</span> <span class="token comment">// &quot;[object Undefined]&quot;</span>
<span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token comment">// &quot;[object Null]&quot;</span>
<span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>Math<span class="token punctuation">)</span> <span class="token comment">// &quot;[object Math]&quot;</span>
<span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment">// &quot;[object Object]&quot;</span>
<span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token comment">// &quot;[object Array]&quot;</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></div></div><p>利用这个特性，可以写出一个比<code>typeof</code>运算符更准确的类型判断函数。</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">var</span> <span class="token function-variable function">type</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">o</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token keyword">var</span> s <span class="token operator">=</span> <span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>o<span class="token punctuation">)</span>
    <span class="token keyword">return</span> s<span class="token punctuation">.</span><span class="token function">match</span><span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\[object (.*?)\]</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token function">type</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// &quot;object&quot;</span>
<span class="token function">type</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// &quot;array&quot;</span>
<span class="token function">type</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// &quot;number&quot;</span>
<span class="token function">type</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// &quot;null&quot;</span>
<span class="token function">type</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// &quot;undefined&quot;</span>
<span class="token function">type</span><span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">abcd</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// &quot;regex&quot;</span>
<span class="token function">type</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// &quot;date&quot;</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>在上面这个<code>type</code>函数的基础上，还可以加上专门判断某种类型数据的方法。</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">var</span> <span class="token function-variable function">type</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">o</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
  <span class="token keyword">var</span> s <span class="token operator">=</span> <span class="token class-name">Object</span><span class="token punctuation">.</span>prototype<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>o<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">return</span> s<span class="token punctuation">.</span><span class="token function">match</span><span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\[object (.*?)\]</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

<span class="token punctuation">[</span><span class="token string">'Null'</span><span class="token punctuation">,</span>
 <span class="token string">'Undefined'</span><span class="token punctuation">,</span>
 <span class="token string">'Object'</span><span class="token punctuation">,</span>
 <span class="token string">'Array'</span><span class="token punctuation">,</span>
 <span class="token string">'String'</span><span class="token punctuation">,</span>
 <span class="token string">'Number'</span><span class="token punctuation">,</span>
 <span class="token string">'Boolean'</span><span class="token punctuation">,</span>
 <span class="token string">'Function'</span><span class="token punctuation">,</span>
 <span class="token string">'RegExp'</span>
<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">t</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  type<span class="token punctuation">[</span><span class="token string">'is'</span> <span class="token operator">+</span> t<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">o</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">type</span><span class="token punctuation">(</span>o<span class="token punctuation">)</span> <span class="token operator">===</span> t<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

type<span class="token punctuation">.</span><span class="token function">isObject</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token comment">// true</span>
type<span class="token punctuation">.</span><span class="token function">isNumber</span><span class="token punctuation">(</span><span class="token number">NaN</span><span class="token punctuation">)</span> <span class="token comment">// true</span>
type<span class="token punctuation">.</span><span class="token function">isRegExp</span><span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">abc</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">)</span> <span class="token comment">// true</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><span class="line-number">22</span><br><span class="line-number">23</span><br></div></div></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/heBody/blog/edit/master/docs/01.前端/25.JavaScript文章/100.比typeof运算符更准确的类型判断.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/7a91be2d502346ce/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">JS获取和修改url参数</div></a> <a href="/blog/pages/8481d1/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">四级文件(测试)</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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