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class="fa-fw fas fa-archive"></i><span> 归档</span></a></li><li><a class="site-page child" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></li><li><a class="site-page child" target="_blank" rel="noopener" href="https://buy.dreamlove.top/"><i class="fa-fw fas fa-heart"></i><span> 购物</span></a></li></ul></div></div><div id="toggle-menu"><a class="site-page" href="javascript:void(0);"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">今日刷题-类型转换必须解决</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2022-05-08T09:45:40.000Z" title="发表于 2022-05-08 09:45:40">2022-05-08</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-05-29T09:45:00.000Z" title="更新于 2022-05-29 09:45:00">2022-05-29</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E5%88%B7%E9%A2%98/">刷题</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.4k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>5分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" data-flag-title="今日刷题-类型转换必须解决"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h3 id="题目1"><a href="#题目1" class="headerlink" title="题目1"></a>题目1</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">下面结果为真的表达式是：（）</span><br><span class="line"><span class="attr">A</span>: <span class="literal">null</span> <span class="keyword">instanceof</span> <span class="title class_">Object</span></span><br><span class="line"></span><br><span class="line"><span class="attr">B</span>: <span class="literal">null</span> === <span class="literal">undefined</span></span><br><span class="line"></span><br><span class="line"><span class="attr">C</span>: <span class="literal">null</span> == <span class="literal">undefined</span></span><br><span class="line"></span><br><span class="line"><span class="attr">D</span>: <span class="title class_">NaN</span> == <span class="title class_">NaN</span></span><br></pre></td></tr></table></figure><ul><li><p>答案</p><ul><li>C</li></ul></li><li><p>解析</p><ul><li><p>A:</p><ul><li><strong>null</strong> instanceof Object ;// false</li><li>typeof null === ‘object’;// true</li><li><strong>同理</strong></li><li>undefined instanceof Object ; //false</li><li><strong>typeof undefined === ‘undefined’</strong> //true</li></ul></li><li><p>B,C</p><ul><li>null 遇到二个等号( == ) 和 undefined 比较,<strong>无条件返回true</strong></li><li>null 遇到三个等号( === ) 和undefined 比较,<strong>无条件返回false</strong></li></ul></li><li><p>D:</p><ul><li>NaN 不与 任何值相等 包括自身</li></ul></li></ul></li></ul><h3 id="题目2"><a href="#题目2" class="headerlink" title="题目2"></a>题目2</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">以下哪个语句打印出来的结果是<span class="literal">false</span>？</span><br><span class="line"><span class="attr">A</span>: <span class="title function_">alert</span>(<span class="number">3</span> == <span class="literal">true</span>)</span><br><span class="line"></span><br><span class="line"><span class="attr">B</span>: <span class="title function_">alert</span>(<span class="number">2</span> == <span class="string">'2'</span>)</span><br><span class="line"></span><br><span class="line"><span class="attr">C</span>: <span class="title function_">alert</span>(<span class="literal">null</span> == <span class="literal">undefined</span>)</span><br><span class="line"></span><br><span class="line"><span class="attr">D</span>: <span class="title function_">alert</span>(<span class="built_in">isNaN</span>(<span class="string">'true'</span>))</span><br></pre></td></tr></table></figure><ul><li><p>答案</p><ul><li>A</li></ul></li><li><p>解析</p><ul><li><p>A: == 会隐式转换,二个都是基本数据类型比较,true转化为数字为1,然后3==1返回false</p></li><li><p>B: == 会隐式转换,二个都是基本数据类型比较,都转化为数字,字符串’2’ 转化为数字为2,所以 2 == 2返回为true</p></li><li><p>C: null 遇到2个等号(==) 和undefined 无条件返回true**(规定)**</p></li><li><p>D: isNaN的转换好像都是将参数通过**Number()**来进行转换,凡是Number不能转换的都返回NaN</p><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">isNaN</span>(<span class="number">123</span>) <span class="comment">//false</span></span><br><span class="line"><span class="built_in">isNaN</span>(-<span class="number">1.23</span>) <span class="comment">//false</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="number">5</span>-<span class="number">2</span>) <span class="comment">//false</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="number">0</span>) <span class="comment">//false</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="string">'123'</span>) <span class="comment">//false</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="string">'Hello'</span>) <span class="comment">//true</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="string">'2005/12/12'</span>) <span class="comment">//true</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="string">''</span>) <span class="comment">//false</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="literal">true</span>) <span class="comment">//false</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="literal">undefined</span>) <span class="comment">//true</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="string">'NaN'</span>) <span class="comment">//true</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="title class_">NaN</span>) <span class="comment">//true</span></span><br><span class="line"><span class="built_in">isNaN</span>(<span class="number">0</span> / <span class="number">0</span>) <span class="comment">//true</span></span><br></pre></td></tr></table></figure></li></ul></li></ul><p><strong>总结下</strong></p><ol><li><p>只要是<strong>基本数据类型</strong>的 <code>==</code> 比较,都会转化为数值来进行比较</p></li><li><p>只要是<strong>引用数据类型</strong>和<strong>基本数据类型</strong>的的比较,都会转化为<strong>字符串</strong> 然后 转化为 <strong>被比较的基本数据的类型</strong> 后 <strong>再进行比较</strong>((除了引用数据类型和布尔值进行比较的时候是将二者转化为布尔值比较))</p></li><li><p>(比如 对象和布尔值比较 )</p><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出结果为false</span></span><br><span class="line"><span class="comment">// 过程: [ ]转换为字符串'',然后转换为数字0,true转换为数字1，所以为false</span></span><br><span class="line">[] == <span class="literal">true</span>; </span><br></pre></td></tr></table></figure></li><li><p>(比如 对象和数字比较)</p><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 输出结果为true</span></span><br><span class="line"><span class="comment">// 过程: [1]转化为字符串'1' ,然后转化为数字1 然后数字1 和 1进行比较 ,返回true</span></span><br><span class="line">[<span class="number">1</span>] == <span class="number">1</span>; </span><br></pre></td></tr></table></figure></li><li><p>还有一些需要记住的，像</p><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="literal">null</span> == <span class="literal">undefined</span> <span class="comment">// true null和undefined二个等于号比较则返回true,二者和其他比较就返回false</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//举例子,下方的就是</span></span><br><span class="line"><span class="literal">null</span> == <span class="literal">false</span> <span class="comment">//false</span></span><br><span class="line"></span><br><span class="line"><span class="literal">null</span> === <span class="literal">null</span> <span class="comment">//为true</span></span><br><span class="line"><span class="literal">undefined</span> === <span class="literal">undefined</span> <span class="comment">//为true</span></span><br></pre></td></tr></table></figure></li><li><p>具体可以看这个博主写的<a target="_blank" rel="noopener" href="https://www.cnblogs.com/ljk001/p/8086084.html">js中的一些隐式转换和总结</a></p></li></ol><h4 id="题目2扩展"><a href="#题目2扩展" class="headerlink" title="题目2扩展"></a>题目2扩展</h4><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//各自的返回结果是?</span></span><br><span class="line"><span class="number">1</span> == <span class="literal">true</span></span><br><span class="line"><span class="string">""</span> == <span class="literal">false</span></span><br><span class="line"><span class="literal">false</span> == <span class="literal">null</span></span><br><span class="line"><span class="literal">null</span> == <span class="literal">undefined</span></span><br></pre></td></tr></table></figure><ul><li>答案<ul><li><code>1 == true</code> ;// true (基本数据类型和布尔值比较,二者转化为数值 <code>1</code> 不变化 <code>true</code>变为了<code>1</code>,所以二者相等返回true)</li><li><code>"" == false</code>; // true (基本数据类型和布尔值比较 , 二者转化为数值, <code>""</code>转化为数值为<code>0</code>, <code>false</code>变为0,所以二者相等返回true)</li><li><code>false == null</code>; // false (null除了和undefined二个等号比较返回为true,null和其他比较均返回为false(undefined也是))</li><li><code>null == undefined</code>;// true (<code>null</code> 和 <code>undefined</code> 比较,返回为true,<strong>可以看上面第五条</strong>)</li></ul></li></ul><h3 id="扩展"><a href="#扩展" class="headerlink" title="扩展"></a>扩展</h3><ul><li>对象转换为数字的时候的时候,会依次调用<code>valueOf</code>方法和<code>toString</code>方法,我们可以进行重写这二个方法来完成一些看似不可能的操作<ul><li>valueOf 取出对象内部的值，不进行类型转换 <a target="_blank" rel="noopener" href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf">mdnDoc文档地址</a></li><li>toString 一定将所有内容转为字符串! <a target="_blank" rel="noopener" href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/toString">mdnDoc文档地址</a></li></ul></li><li>当调用valueOf方法没有获取到基本数据类型的时候,就会再次调用toString方法</li></ul><p><strong>证明1:当调用valueOf方法没有获取到基本数据类型的时候,就会再次调用toString方法</strong></p><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> a = [];</span><br><span class="line"><span class="title class_">Array</span>.<span class="property"><span class="keyword">prototype</span></span>.<span class="property">valueOf</span> = <span class="keyword">function</span> (<span class="params"></span>) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"你调用了我1"</span>);</span><br><span class="line"> <span class="keyword">return</span> [];</span><br><span class="line">};</span><br><span class="line"><span class="title class_">Array</span>.<span class="property"><span class="keyword">prototype</span></span>.<span class="property">toString</span> = <span class="keyword">function</span> (<span class="params"></span>) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"你调用了我2"</span>);</span><br><span class="line">}</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>([] == <span class="literal">false</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">//依次输出</span></span><br><span class="line"><span class="comment">// 你调用了我1</span></span><br><span class="line"><span class="comment">// 你调用了我2</span></span><br><span class="line"><span class="comment">// false </span></span><br></pre></td></tr></table></figure><p><strong>证明2:当调用valueOf方法没有获取到基本数据类型的时候,就会再次调用toString方法</strong></p><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> test = {</span><br><span class="line"> <span class="attr">name</span>:<span class="string">"李白"</span>,</span><br><span class="line"> <span class="title function_">valueOf</span>(<span class="params"></span>){</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"你调用了我1"</span>);</span><br><span class="line"> <span class="keyword">return</span> {};</span><br><span class="line"> },</span><br><span class="line"> <span class="title function_">toString</span>(<span class="params"></span>){</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"你调用了我2"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(test == <span class="literal">false</span>);</span><br><span class="line"><span class="comment">//依次输出 </span></span><br><span class="line"><span class="comment">// 你调用了我1</span></span><br><span class="line"><span class="comment">// 你调用了我2</span></span><br><span class="line"><span class="comment">// false </span></span><br></pre></td></tr></table></figure><p><strong>证明3:当调用valueOf方法没有获取到基本数据类型的时候,就会再次调用toString方法</strong></p><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> test = {</span><br><span class="line"> <span class="attr">name</span>:<span class="string">"李白"</span>,</span><br><span class="line"> <span class="title function_">valueOf</span>(<span class="params"></span>){</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"你调用了我1"</span>);</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"777"</span>;</span><br><span class="line"> },</span><br><span class="line"> <span class="title function_">toString</span>(<span class="params"></span>){</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"你调用了我2"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(test == <span class="literal">false</span>);</span><br><span class="line"><span class="comment">//依次输出</span></span><br><span class="line"><span class="comment">// 你调用了我1</span></span><br><span class="line"><span class="comment">// false</span></span><br></pre></td></tr></table></figure><p>也许有人会说,为什么我重写了valueOf方法和toString方法还是只会调用valueOf啊</p><ul><li>那是因为你没有加return,你没加return在valueOf方法里面,那么相同会自动添加<code>return undefined</code></li></ul><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> test = {</span><br><span class="line"> <span class="attr">name</span>:<span class="string">"李白"</span>,</span><br><span class="line"> <span class="title function_">valueOf</span>(<span class="params"></span>){</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"你调用了我1"</span>);</span><br><span class="line"> },</span><br><span class="line"> <span class="title function_">toString</span>(<span class="params"></span>){</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"你调用了我2"</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(test == <span class="literal">false</span>);</span><br><span class="line"><span class="comment">//可能你们是这样子写的</span></span><br><span class="line"><span class="comment">//然后发现只有 你调用了我1 和false输出</span></span><br><span class="line"><span class="comment">// 你return下任意的引用数据类型就可以了</span></span><br></pre></td></tr></table></figure><h4 id="有没有什么办法可以使得-a-1-a-2-a-3为真"><a href="#有没有什么办法可以使得-a-1-a-2-a-3为真" class="headerlink" title="有没有什么办法可以使得 a==1 && a==2 && a==3为真?"></a>有没有什么办法可以使得 a==1 && a==2 && a==3为真?</h4><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> a = {</span><br><span class="line"> <span class="attr">num</span>:<span class="number">1</span>,</span><br><span class="line"> <span class="title function_">valueOf</span>(<span class="params"></span>){</span><br><span class="line"> <span class="comment">//每次都是先返回在自增1</span></span><br><span class="line"> <span class="keyword">return</span> <span class="variable language_">this</span>.<span class="property">num</span>++;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(a==<span class="number">1</span> && a==<span class="number">2</span> && a==<span class="number">3</span>);<span class="comment">//true</span></span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta"><i class="fas fa-circle-user fa-fw"></i>文章作者: </span><span class="post-copyright-info"><a href="https://www.dreamlove.top">梦洁</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta"><i class="fas fa-square-arrow-up-right fa-fw"></i>文章链接: </span><span class="post-copyright-info"><a href="https://www.dreamlove.top/40766dbf.html">https://www.dreamlove.top/40766dbf.html</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta"><i class="fas fa-circle-exclamation fa-fw"></i>版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://www.dreamlove.top" 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class="toc-text">题目2扩展</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%89%A9%E5%B1%95"><span class="toc-number">3.</span> <span class="toc-text">扩展</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%9C%89%E6%B2%A1%E6%9C%89%E4%BB%80%E4%B9%88%E5%8A%9E%E6%B3%95%E5%8F%AF%E4%BB%A5%E4%BD%BF%E5%BE%97-a-1-a-2-a-3%E4%B8%BA%E7%9C%9F"><span class="toc-number">3.1.</span> <span class="toc-text">有没有什么办法可以使得 a==1 && a==2 && a==3为真?</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/bbed5cd2.html" title="大家好我是夯大力,这是我的影视,大力金刚等系列"><img src="https://dreamos.oss-cn-beijing.aliyuncs.com/gitblog/202410091600476.png" onerror='this.onerror=null,this.src="/img/404.png"' alt="大家好我是夯大力,这是我的影视,大力金刚等系列"></a><div class="content"><a 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