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id="local-search-result"></div></div></div></nav></div></header><main id="main" class="main"><div class="main-inner"><div class="content-wrap"><div id="content" class="content"><div id="posts" class="posts-expand"><article class="post post-type-normal" itemscope itemtype="http://schema.org/Article"><div class="post-block"><link itemprop="mainEntityOfPage" href="https://www.jealyn.top/jsexer30-ans.html"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="name" content="jealyn.wang"><meta itemprop="description" content="前端小白一枚"><meta itemprop="image" content="/images/avatar.png"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Jealyn的个人网站"></span><header class="post-header"><h2 class="post-title" itemprop="name headline">前端基础练习题第30天 答案及解析</h2><div class="post-meta"><span class="post-time"><span class="post-meta-item-icon"><i class="fa fa-calendar-o"></i> </span><span class="post-meta-item-text"></span> <time title="创建于" itemprop="dateCreated datePublished" datetime="2019-06-15T19:12:15+08:00">2019-06-15 </time></span><span class="post-category"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-folder-o"></i> </span><span class="post-meta-item-text"></span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/JS基础练习题/" itemprop="url" rel="index"><span itemprop="name">JS基础练习题</span> </a></span>， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/JS基础练习题/答案及解析/" itemprop="url" rel="index"><span itemprop="name">答案及解析</span> </a></span></span><span class="post-meta-divider">|</span> <span class="page-pv"><i class="fa fa-eye"></i> 阅读数 <span class="busuanzi-value" id="busuanzi_value_page_pv"></span>次</span><div class="post-wordcount"><span class="post-meta-item-icon"><i class="fa fa-file-word-o"></i> </span><span class="post-meta-item-text">字数统计:</span> <span title="字数统计">690 字 </span><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-clock-o"></i> </span><span class="post-meta-item-text">阅读时长 ≈</span> <span title="阅读时长">2 分钟</span></div></div></header><div class="post-body" itemprop="articleBody"><blockquote><p>本篇文章是前端基础练习题第三十天的答案及解析部分，纯题目部分请移步<a href="/jsexer30.html" title="前端基础练习题 第30天">前端基础练习题 第30天</a></p></blockquote><a id="more"></a><h2 id="正文"><a href="#正文" class="headerlink" title="正文"></a>正文</h2><p>1.JS中常见的内存泄漏原因有哪些？<br></p><div class="note info"><h3 id="常见的内存泄漏原因有4个："><a href="#常见的内存泄漏原因有4个：" class="headerlink" title="常见的内存泄漏原因有4个："></a>常见的内存泄漏原因有4个：</h3><ul><li>全局变量引起内存泄漏</li><li>闭包引起内存泄漏</li><li><code>DOM</code>清空或删除时，事件未清除导致的内存泄漏</li><li>子元素存在引用引起的内存泄漏</li></ul></div><p></p><p style="height:10px"></p><p></p><p>2.相比于原生js，使用<code>jQuery</code>有哪些好处？<br></p><div class="note info"><h3 id="jQuery具有如下优点："><a href="#jQuery具有如下优点：" class="headerlink" title="jQuery具有如下优点："></a><code>jQuery</code>具有如下优点：</h3><ul><li>它有强大的选择器、出色的<code>DOM</code>操作的封装</li><li>有可靠的事件处理机制</li><li>有完善的<code>ajax</code>封装</li><li>具备出色的浏览器兼容性</li><li>支持链式操作和隐式迭代</li><li>具有完善的文档和丰富的插件</li></ul></div><p></p><p style="height:10px"></p><p></p><p>3.<code>jQuery</code>中的<code>$</code>符号是什么？<br></p><div class="note info"><h3 id="符号只是jQuery的别名，它是jQuery的选择器，通过它可将DOM对象转为jQuery对象。当然，也完全可以使用jQuery来代替-。"><a href="#符号只是jQuery的别名，它是jQuery的选择器，通过它可将DOM对象转为jQuery对象。当然，也完全可以使用jQuery来代替-。" class="headerlink" title="$符号只是jQuery的别名，它是jQuery的选择器，通过它可将DOM对象转为jQuery对象。当然，也完全可以使用jQuery来代替$。"></a><code>$</code>符号只是<code>jQuery</code>的别名，它是<code>jQuery</code>的选择器，通过它可将<code>DOM</code>对象转为<code>jQuery</code>对象。当然，也完全可以使用<code>jQuery</code>来代替$。</h3></div><p></p><p style="height:10px"></p><p></p><p>4.<code>jQuery</code>对象和<code>DOM</code>对象如何转化？<br></p><div class="note info"><h3 id="jQuery对象是一个包含了DOM对象的数组。可通过jQuery对象-下标-来获取DOM对象，也可通过-DOM对象-来将DOM对象转换为jQuery对象。"><a href="#jQuery对象是一个包含了DOM对象的数组。可通过jQuery对象-下标-来获取DOM对象，也可通过-DOM对象-来将DOM对象转换为jQuery对象。" class="headerlink" title="jQuery对象是一个包含了DOM对象的数组。可通过jQuery对象[下标]来获取DOM对象，也可通过$(DOM对象)来将DOM对象转换为jQuery对象。"></a><code>jQuery</code>对象是一个包含了<code>DOM</code>对象的数组。可通过<code>jQuery对象[下标]</code>来获取<code>DOM</code>对象，也可通过<code>$(DOM对象)</code>来将<code>DOM</code>对象转换为<code>jQuery</code>对象。</h3></div><p></p><p style="height:10px"></p><p></p><p>5.<code>jQuery</code>中有几类选择器？<br></p><div class="note info"><h3 id="jQuery中大致有5类选择器："><a href="#jQuery中大致有5类选择器：" class="headerlink" title="jQuery中大致有5类选择器："></a><code>jQuery</code>中大致有5类选择器：</h3><ul><li>基本选择器，如<code>$("#id")</code>、<code>$(".class")</code>、<code>$("div")</code>等</li><li>层次选择器，如<code>$("div p")</code>、<code>$("form > input")</code>等</li><li>过滤选择器，如<code>$("li:first")</code>、<code>$("tr:even")</code>等</li><li>属性选择器，如<code>$("input[name='text']")</code>等</li><li>表单选择器，如<code>$(":hidden")</code>、<code>$(":selected")</code>等</li></ul></div><p></p><p style="height:10px"></p><p></p><p>6.<code>jQuery</code>如何去操作样式？<br></p><div class="note info"><h3 id="如下所示："><a href="#如下所示：" class="headerlink" title="如下所示："></a>如下所示：</h3><ul><li><code>jQuery</code>添加类名，<code>addClass()</code></li><li><code>jQuery</code>删除类名，<code>removeClass()</code></li><li><code>jQuery</code>切换类名，如果有就移除，如果没有就添加，<code>toggleClass()</code></li><li>或者直接操作<code>CSS</code>，方式为<code>$('dom').css({ key: value })</code>。</li></ul></div><p></p><p style="height:10px"></p><p></p><p>7.请使用<code>jQuery</code>编写一个函数，此函数绑定到<code>body</code>的<code>mousemove</code>事件上，在事件中输出鼠标的位置。<br></p><div class="note info"><h3 id="参考代码如下所示："><a href="#参考代码如下所示：" class="headerlink" title="参考代码如下所示："></a>参考代码如下所示：</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></pre></td><td class="code"><pre><span class="line">$(<span class="string"><code>'body'</code></span>).mousemove(<span class="function"><span class="keyword">function</span>(<span class="params">e</span>) </span>{</span><br><span class="line"> <span class="built_in">console</span>.log(e.pageX, e.pageY);</span><br><span class="line">})</span><br></pre></td></tr></table></figure></div><div class="note warning"><p>可通过事件对象的<code>pageX</code>、<code>pageY</code>属性获得鼠标的位置。</p></div><p></p><p style="height:10px"></p><p style="height:10px">8.利用<code>jQuery</code>编写代码，使页面中的第一个表格能够进行隔行换色(表格的奇数行与偶数行的背景色不同)。</p><p style="height:10px"></p><div class="note info"><h3 id="参考代码如下所示："><a href="#参考代码如下所示：" class="headerlink" title="参考代码如下所示："></a>参考代码如下所示：</h3><figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$(<code>'</code>table:first tr:even<code>'</code>).css(<code>'</code>backgroundColor<code>'</code>, <code>'</code>#ccc<code>'</code>)</span><br></pre></td></tr></table></figure></div><div class="note warning"><p>本题主要是考察<code>jQuery</code>过滤选择器和其对<code>CSS</code>的操作方法。</p></div><p></p><p style="height:10px"></p><h2 id="说明"><a href="#说明" class="headerlink" title="说明"></a>说明</h2><ol><li><p>题目中出现的JS指的是采用ECMAScript 2015及之后标准的JavaScript</p></li><li><p>答案中，若有错误和需完善的地方，可在下方留言反馈哈~~</p></li><li><p>查看纯习题版，请点击<a href="/jsexer30.html" title="前端基础练习题 第30天">前端基础练习题 第30天</a></p></li></ol></div><div><div><div style="text-align:center;color:#ccc;font-size:14px;letter-spacing:.2rem">--本文结束 <i class="fa fa-heart"></i> 感谢阅读--</div></div></div><div><div style="padding:10px 0;margin:20px auto;width:90%;text-align:center"><div>创作十分不易，原创更应鼓励</div><button id="rewardButton" disable="enable" onclick='var e=document.getElementById("QR");"none"===e.style.display?e.style.display="block":e.style.display="none"'><span>打赏</span></button><div id="QR" style="display:none"><div id="wechat" style="display:inline-block"><img id="wechat_qr" src="/images/wechatpay.png" alt="jealyn.wang 微信支付"><p>微信支付</p></div><div 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class="nav-number">1.5.</span> <span class="nav-text">jQuery中大致有5类选择器：</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#如下所示："><span class="nav-number">1.6.</span> <span class="nav-text">如下所示：</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#参考代码如下所示："><span class="nav-number">1.7.</span> <span class="nav-text">参考代码如下所示：</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#参考代码如下所示："><span class="nav-number">1.8.</span> <span class="nav-text">参考代码如下所示：</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#说明"><span class="nav-number">2.</span> <span class="nav-text">说明</span></a></li></ol></div></div></section></div></aside></div></main><footer id="footer" class="footer"><div class="footer-inner"><div class="copyright">© <span itemprop="copyrightYear">2019</span> <span class="with-love"><i class="fa fa-user"></i> </span><span class="author" 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