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class="post-meta-date-updated" datetime="2022-04-22T18:25:07.000Z" title="更新于 2022-04-22 18:25:07">2022-04-22</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">804</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>3分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" data-flag-title="今日刷题-js的call,apply为null,undefined的情况和日期的注意点"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">a</span>(<span class="params"></span>){</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="variable language_">this</span>);</span><br><span class="line">} </span><br><span class="line">a.<span class="title function_">call</span>(<span class="literal">null</span>);<span class="comment">//输出结果为?</span></span><br></pre></td></tr></table></figure><ul><li>答案<ul><li>window</li></ul></li><li>解析<ul><li>call,apply用于改变this的指向,并且可以让任意函数成为某一对象的方法进行调用</li><li><strong>特别的是</strong><ul><li>null或undefined时，将是JS执行环境的全局变量。浏览器中是window，其它环境（如node）则是global。</li><li><a target="_blank" rel="noopener" href="http://es5.github.io/#x15.3.4.4">ECMAScript5.1 15.3.4.4中有解释</a></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></pre></td><td class="code"><pre><span class="line">有<span class="keyword">var</span> d = <span class="keyword">new</span> <span class="title class_">Date</span>(<span class="string">'2018-05-09'</span>)，可以设置为<span class="number">6</span>月份的操作是？（）(多选)</span><br><span class="line"><span class="attr">A</span>: d.<span class="title function_">setMonth</span>(<span class="number">7</span>);</span><br><span class="line"><span class="attr">B</span>: d.<span class="title function_">setMonth</span>(<span class="number">6</span>);</span><br><span class="line"><span class="attr">C</span>: d.<span class="title function_">setMonth</span>(<span class="number">5</span>);</span><br><span class="line"><span class="attr">D</span>: d.<span class="title function_">setDate</span>(<span class="number">40</span>);</span><br></pre></td></tr></table></figure><ul><li><p>答案</p><ul><li>C与D</li></ul></li><li><p>解析</p><ul><li><p>C : js当中的月份是从0开始算的,0代表1月,11代表12月,所以设置的时候需要减少1,所以d.setMonth(5)为设置6月份</p></li><li><p>D : 看看菜鸟教程当中的setDate(day)解释</p><table><thead><tr><th align="left">参数</th><th align="left">描述</th></tr></thead><tbody><tr><td align="left"><em>day</em></td><td align="left">必需。<br><strong>表示一个月中的一天的一个数值（1 ~ 31</strong>）<br>0 为上一个月的最后一天<br>-1 为上一个月最后一天之前的一天<br><strong>如果当月有 31 天</strong><br>32 为下个月的第一天<br><strong>如果当月有 30 天</strong><br>32 为下一个月的第二天</td></tr></tbody></table></li></ul></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></pre></td><td class="code"><pre><span class="line"><span class="comment">//五月有31天,所以只需要大于31就是设置下一个月了(其实设置大于31的数字都可以设置到下一个月,只不过下一个是记号的区别而已~)</span></span><br><span class="line"><span class="keyword">var</span> time = <span class="keyword">new</span> <span class="title class_">Date</span>(<span class="string">"2018-05-09"</span>);</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">`<span class="subst">${time.getFullYear()}</span>年<span class="subst">${time.getMonth()+<span class="number">1</span>}</span>月<span class="subst">${time.getDate()}</span>日`</span>);<span class="comment">//2018年5月9日</span></span><br><span class="line">time.<span class="title function_">setDate</span>(<span class="number">42</span>);</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">`<span class="subst">${time.getFullYear()}</span>年<span class="subst">${time.getMonth()+<span class="number">1</span>}</span>月<span class="subst">${time.getDate()}</span>日`</span>);<span class="comment">//2018年6月12日</span></span><br></pre></td></tr></table></figure><h3 id="题目3"><a href="#题目3" class="headerlink" title="题目3"></a>题目3</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></pre></td><td class="code"><pre><span class="line"><span class="comment">//说出A,B,C,D输出结果</span></span><br><span class="line"><span class="attr">A</span>: <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="number">1</span>+ <span class="string">"2"</span>+<span class="string">"2"</span>);</span><br><span class="line"><span class="attr">B</span>: <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="number">1</span>+ +<span class="string">"2"</span>+<span class="string">"2"</span>);</span><br><span class="line"><span class="attr">C</span>: <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"A"</span>- <span class="string">"B"</span>+<span class="string">"2"</span>);</span><br><span class="line"><span class="attr">D</span>: <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"A"</span>- <span class="string">"B"</span>+<span class="number">2</span>);</span><br></pre></td></tr></table></figure><ul><li><p>答案</p><ul><li>122 => ( 如果typeof (1+ “2”+”2”) 那么输出结果为”string” )</li><li>32 => ( 如果typeof (1+ +”2”+”2”) 那么输出结果为”string” )</li><li>NaN2</li><li>NaN</li></ul></li><li><p>解析</p><ul><li>A : 做加法时要注意双引号，当使用双引号时，JavaScript认为是字符串，字符串相加等于字符串合并。<br>因此，这里相当于字符串的合并，即为122.</li><li>B : 第一个+”2”中的加号是一元加操作符，+”2”会变成数值2，因此1+ +”2”相当于1+2=3.<br>然后和后面的字符串“2”相合并，变成了字符串”32”.</li><li>C : 第一个+”2”中的加号是一元加操作符，+”2”会变成数值2，因此1+ +”2”相当于1+2=3.<br>然后和后面的字符串“2”相合并，变成了字符串”32”.<ul><li>同样的操作还有 * “1” => 相当于把字符串1转化为数字1</li></ul></li><li>“A”-“B”的运算中，需要先把”A”和”B”用Number函数转换为数值，其结果为NaN，在减发操作中，如果有一个是NaN，则结果是NaN，因此”A”-“B”结果为NaN。<br>然后和”2”进行字符串合并(<strong>这里的+为什么是合并那是因为加数为字符串类型</strong>)，变成了NaN2.</li><li>D :”A”-“B”结果为NaN，然后和数值2进行<strong>加法</strong>操作，在加法操作中，如果有一个操作数是NaN，则结果为NaN。</li></ul></li></ul></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: 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