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<!DOCTYPE html>
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<article id="post-作用域链与闭包" class="article article-type-post article-index" itemscope itemprop="blogPost">
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2018/03/12/作用域链与闭包/">作用域与闭包</a>
</h1>
<a href="/2018/03/12/作用域链与闭包/" class="archive-article-date">
<time datetime="2018-03-12T08:14:57.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-03-12</time>
</a>
</header>
<div class="article-entry" itemprop="articleBody">
<blockquote>
<p> 下面部分内容引用《你不知道JavaScript》</p>
</blockquote>
<h4 id="作用域"><a href="#作用域" class="headerlink" title="作用域"></a>作用域</h4><blockquote>
<p>作用域是一套规则，用于确定在何处及如何查找变量。如果查找的目的是对<br>变量进行赋值，那么就会使用 LHS 查询;如果目的是获取变量的值，就会使用 RHS 查询。查找失败的话则会抛出ReferenceError（对这个变量进行不正确的操作时候会抛出TypeError）</p>
<ul>
<li>ReferenceError 同作用域判别失败相关，而 TypeError 则代表作用域判别成功了，但是对 结果的操作是非法或不合理的。</li>
</ul>
</blockquote>
<p>作用域查找会在找到第一个匹配的标识符时停止。<br><figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">a</span> (<span class="params"></span>) </span>{</div><div class="line"> <span class="keyword">var</span> b = <span class="string">'lol'</span></div><div class="line"> <span class="function"><span class="keyword">function</span> <span class="title">c</span> (<span class="params"></span>) </span>{</div><div class="line"> <span class="keyword">var</span> b = <span class="string">'LOLLLLL'</span></div><div class="line"> <span class="built_in">console</span>.log(b)</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> c()</div><div class="line">}</div><div class="line">a() <span class="comment">// LOLLLLL</span></div></pre></td></tr></table></figure></p>
<h4 id="eval"><a href="#eval" class="headerlink" title="eval"></a>eval</h4><p>eval 接收一个字符串为参数，可以在运行时解析字符串，动态改变词法作用域。<br><figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">foo</span>(<span class="params">str, a</span>) </span>{ </div><div class="line"> <span class="built_in">eval</span>( str ); <span class="comment">// 欺骗! console.log( a, b );</span></div><div class="line">}</div><div class="line"><span class="keyword">var</span> b = <span class="number">2</span>;</div><div class="line">foo( <span class="string">"var b = 3;"</span>, <span class="number">1</span> ); <span class="comment">// 1, 3</span></div><div class="line">在严格模式的程序中，<span class="built_in">eval</span>(..) 在运行时有其自己的词法作用域，意味着其 中的声明无法修改所在的作用域。</div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">foo</span>(<span class="params">str</span>) </span>{ <span class="string">"use strict"</span>;</div><div class="line"><span class="built_in">eval</span>( str );</div><div class="line"> <span class="built_in">console</span>.log( a ); <span class="comment">// ReferenceError: a is not de ned</span></div><div class="line"> }</div><div class="line"> foo( <span class="string">"var a = 2"</span> );</div></pre></td></tr></table></figure></p>
<h4 id="作用域链"><a href="#作用域链" class="headerlink" title="作用域链"></a>作用域链</h4><blockquote>
<p>当查找变量的时候，会在当前从上下文的变量对象中查找，如果没有找到这个变量，那么它会寻找父级的，直到最顶层全局作用域。这样多个执行上下文的变量构成的链表就叫做作用域链。</p>
</blockquote>
<p>JS的语法风格和C/C++类似, 但作用域的实现却和C/C++不同，并非用“堆栈”方式，而是使用列表，具体过程如下(ECMA262中所述):</p>
<blockquote>
<p>任何执行上下文时刻的作用域, 都是由作用域链(scope chain, 后面介绍)来实现.<br>在一个函数被定义的时候, 会将它定义时刻的scope chain链接到这个函数对象的[[scope]]属性.<br>在一个函数对象被调用的时候，会创建一个 <strong>活动对象</strong> (也就是一个对象), 然后对于每一个函数的形参，都命名为该活动对象的命名属性, 然后将这个活动对象做为此时的作用域链(scope chain)最前端, 并将这个函数对象的[[scope]]加入到scope chain中.</p>
</blockquote>
</div>
<div class="article-info article-info-index">
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<ul class="article-tag-list">
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag article-tag-list-link color5">code</a>
</li>
</ul>
</div>
<p class="article-more-link">
<a class="article-more-a" href="/2018/03/12/作用域链与闭包/">read more >></a>
</p>
<div class="clearfix"></div>
</div>
</div>
</article>
<article id="post-web安全" class="article article-type-post article-index" itemscope itemprop="blogPost">
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2018/03/06/web安全/">web安全</a>
</h1>
<a href="/2018/03/06/web安全/" class="archive-article-date">
<time datetime="2018-03-06T10:36:34.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-03-06</time>
</a>
</header>
<div class="article-entry" itemprop="articleBody">
</div>
<div class="article-info article-info-index">
<p class="article-more-link">
<a class="article-more-a" href="/2018/03/06/web安全/">read more >></a>
</p>
<div class="clearfix"></div>
</div>
</div>
</article>
<article id="post-执行上下文" class="article article-type-post article-index" itemscope itemprop="blogPost">
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2018/03/02/执行上下文/">执行上下文</a>
</h1>
<a href="/2018/03/02/执行上下文/" class="archive-article-date">
<time datetime="2018-03-02T06:49:08.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-03-02</time>
</a>
</header>
<div class="article-entry" itemprop="articleBody">
<h4 id="执行上下文"><a href="#执行上下文" class="headerlink" title="执行上下文"></a>执行上下文</h4><p>首先明确几个概念：</p>
<ul>
<li>EC：函数执行环境（或执行上下文），Execution Context</li>
<li>ECS：执行环境栈，Execution Context Stack</li>
<li>VO：变量对象，Variable Object</li>
<li>AO：活动对象，Active Object</li>
<li>scope chain：作用域链</li>
</ul>
<p>每次当控制器转到可执行代码的时候，就会进入一个执行上下文。执行上下文可以理解为当前代码的执行环境，它会形成一个作用域。</p>
<blockquote>
<p>可执行代码的类型<br>全局代码（Global code）<br>这种类型的代码是在”程序”级处理的：例如加载外部的js文件或者本地<script></script>标签内的代码。全局代码不包括任何function体内的代码。 这个是默认的代码运行环境，一旦代码被载入，引擎最先进入的就是这个环境。</p>
<p>函数代码（Function code）<br>任何一个函数体内的代码，但是需要注意的是，具体的函数体内的代码是不包括内部函数的代码。</p>
<p>Eval代码（Eval code）<br>eval内部的代码</p>
</blockquote>
<h4 id="变量对象"><a href="#变量对象" class="headerlink" title="变量对象"></a>变量对象</h4><blockquote>
<p>如果变量与执行上下文相关，那变量自己应该知道它的数据存储在哪里，并且知道如何访问。这种机制称为变量对象(variable object)。</p>
<p>变量对象(缩写为VO)是一个与执行上下文相关的特殊对象，它存储着在上下文中声明的以下内容：<br> 变量 (var, 变量声明);<br> 函数声明 (FunctionDeclaration, 缩写为FD);<br> 函数的形参</p>
</blockquote>
<p>上下文创建阶段： 建立作用域链、确定this的指向<br>上下文执行阶段： 执行代码、变量赋值以及函数引用<br>然后出栈，内存释放<br>参考文章：<br><a href="https://segmentfault.com/a/1190000012646211" target="_blank" rel="external">变量对象详解</a></p>
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<a class="article-title" href="/2018/03/02/内存空间/">内存空间</a>
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<time datetime="2018-03-02T03:05:35.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-03-02</time>
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<h4 id="一、堆和栈"><a href="#一、堆和栈" class="headerlink" title="一、堆和栈"></a>一、堆和栈</h4><p>堆栈是两种数据结构：</p>
<ul>
<li>栈（stack） 栈stack为自动分配的内存空间，它由系统自动释放，先进后出，后进先出；</li>
<li>堆（heap） 堆heap是动态分配的内存，大小不定也不会自动释放，是类似json的key-value存取。</li>
</ul>
<p>JavaScript 中的变量分为基本类型和引用类型。</p>
<ul>
<li><p>基本类型 （Undefined、Null、Boolean、Number、String、Symbol）<br>基本类型在内存中占据空间小、大小固定 ，他们的值保存在栈(stack)空间，是按值来访问</p>
</li>
<li><p>引用类型 （对象、数组、函数）<br>引用类型占据空间大、大小不固定, 栈内存中存放地址指向堆(heap)内存中的对象。是按引用访问的</p>
</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">var</span> a = <span class="number">1</span></div><div class="line"><span class="keyword">var</span> b = a</div><div class="line">b = <span class="number">2</span></div><div class="line"><span class="comment">// a 依然还是1，因为这里的a值是存储在栈内存中的，b直接等于a，相当于开了一个新的栈，彼此之间的值互不影响</span></div><div class="line"><span class="keyword">var</span> c = {<span class="attr">name</span>: <span class="string">'LOL'</span>}</div><div class="line"><span class="keyword">var</span> d = c</div><div class="line">d.name = <span class="string">'王者'</span></div><div class="line"><span class="built_in">console</span>.log(c.name ) <span class="comment">// 王者</span></div><div class="line"><span class="comment">// c的值是存在堆内存中的，换句话说c只是一个指向{name: 'LOL'}内存指针，只是个地址，当 d = c时相当于复制了 c 指针指向同一个内存地址，所以当改变同一个地址上的值的时候，彼此引用的都会改变。</span></div></pre></td></tr></table></figure>
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<a class="article-title" href="/2017/10/26/Linux/">Linux ~~</a>
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<time datetime="2017-10-26T01:56:50.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-10-26</time>
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<h4 id="基础命令"><a href="#基础命令" class="headerlink" title="基础命令"></a>基础命令</h4><h5 id="ls命令"><a href="#ls命令" class="headerlink" title="ls命令"></a>ls命令</h5><blockquote>
<p>ls -l<br>显示详细的文件列表<br>ls -<br>按照上一次修改时间排序文件</p>
</blockquote>
<h5 id="cp命令"><a href="#cp命令" class="headerlink" title="cp命令"></a>cp命令</h5><blockquote>
<p>cp -p fileA fileB<br>从A文件的内容拷贝到B文件<br>cp fileA direB<br>将A文件复制到B目录</p>
</blockquote>
<h5 id="file"><a href="#file" class="headerlink" title="file"></a>file</h5><blockquote>
<p>file A.png 输出文件信息<br>a.txt: ASCII text</p>
</blockquote>
<h5 id="less"><a href="#less" class="headerlink" title="less"></a>less</h5><blockquote>
<p>less a.txt 快速查看文件</p>
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<h5 id="top"><a href="#top" class="headerlink" title="top"></a>top</h5><blockquote>
<p>显示系统状况<br>PID — 进程id<br>USER — 进程所有者<br>PR — 进程优先级<br>NI — nice值。负值表示高优先级，正值表示低优先级<br>VIRT — 进程使用的虚拟内存总量，单位kb。VIRT=SWAP+RES<br>RES — 进程使用的、未被换出的物理内存大小，单位kb。RES=CODE+DATA<br>SHR — 共享内存大小，单位kb<br>S — 进程状态。D=不可中断的睡眠状态 R=运行 S=睡眠 T=跟踪/停止 Z=僵尸进程<br>%CPU — 上次更新到现在的CPU时间占用百分比<br>%MEM — 进程使用的物理内存百分比<br>TIME+ — 进程使用的CPU时间总计，单位1/100秒<br>COMMAND — 进程名称（命令名/命令行）</p>
</blockquote>
<h5 id="tar"><a href="#tar" class="headerlink" title="tar"></a>tar</h5><blockquote>
<p>tar命令可以为linux的文件和目录创建档案。利用tar，可以为某一特定文件创建档案（备份文件）<br>首先要弄清两个概念：打包和压缩。打包是指将一大堆文件或目录变成一个总的文件；压缩则是将一个大的文件通过一些压缩算法变成一个小文件。<br>必要参数有如下：<br>-A 新增压缩文件到已存在的压缩<br>-B 设置区块大小<br>-c 建立新的压缩文件<br>-d 记录文件的差别<br>-r 添加文件到已经压缩的文件<br>-u 添加改变了和现有的文件到已经存在的压缩文件<br>-x 从压缩的文件中提取文件<br>-t 显示压缩文件的内容<br>-z 支持gzip解压文件<br>-j 支持bzip2解压文件<br>-Z 支持compress解压文件<br>-v 显示操作过程<br>-l 文件系统边界设置<br>-k 保留原有文件不覆盖<br>-m 保留文件不被覆盖<br>-W 确认压缩文件的正确性<br>可选参数如下：<br>-b 设置区块数目<br>-C 切换到指定目录<br>-f 指定压缩文件<br>–help 显示帮助信息<br>–version 显示版本信息<br>tar -cvf log.tar log2012.log 仅打包，不压缩！<br>tar -zcvf log.tar.gz log2012.log 打包后，以 gzip 压缩<br>tar -zcvf log.tar.bz2 log2012.log 打包后，以 bzip2 压缩 </p>
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<h5 id="ps-process-status-列举系统运行进程的状态"><a href="#ps-process-status-列举系统运行进程的状态" class="headerlink" title="ps(process status)列举系统运行进程的状态"></a>ps(process status)列举系统运行进程的状态</h5><p>a 显示所有进程<br>-a 显示同一终端下的所有程序<br>-A 显示所有进程<br>c 显示进程的真实名称<br>-N 反向选择<br>-e 等于“-A”<br>e 显示环境变量<br>f 显示程序间的关系<br>-H 显示树状结构<br>r 显示当前终端的进程<br>T 显示当前终端的所有程序<br>u 指定用户的所有进程<br>-au 显示较详细的资讯<br>-aux 显示所有包含其他使用者的行程<br>-C<命令> 列出指定命令的状况<br>–lines<行数> 每页显示的行数<br>–width<字符数> 每页显示的字符数<br>–help 显示帮助信息<br>–version 显示版本显示</p>
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<a class="article-title" href="/2017/10/14/2017入秋/">2017入秋</a>
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<p style="color: #666;font-size:14px"><br> 国庆过后的第一个周末，秋凉袭来，听着张国荣的《春夏秋冬》心情异常平静。<br> 看了会数据结构的书，过了两个钟，终究还是停了下来。觉得这灰蒙蒙的天气适合做点其他事。<br> 我在狭小的屋子走来走去，若有所思，然后坐下来泡了一壶红茶。翻着过去空间写的日志，如此文艺，以至于之前的朋友对我转行写代码觉得不可思议。<br> 转行写代码之后，很少有时间和心情思索一些文艺的事情。偶尔听到过去感动过的歌，才把我带入短暂的思索。<br> 人变化太快，取决于思想的变化。<br> 看着过去在微博和空间发表的心情记录。才发现自己变得那么多，有点惊讶，也有点失落。<br> 因为当时心里一直坚持的想法，现在变得无所谓了。<br> 像是辜负了、背叛了曾经的自己。但是，现在的心里好像也在鄙视着之前的自己，幼稚。<br> 红茶在秋天凉得很快，张国荣的歌也在一首一首播着，这片时光带着秋天的气息，在歌中流淌着，往后的日子听着张国荣应该可以更方便地回忆这段生活。<br> 只是，这样的心情、这样的日子真的越来越少了。<br> 像今天的周末无所事事的日子并不多，不能希冀着夏日过后的第一个秋凉来惊醒自己。<br> 忙碌的生活，更需要抽离自己，站在远处，观望自己，思索此时此时的生活。<br> 忙碌的一生也并不值得庆贺。<br> 而我，希望通过一些文字，在未来仍然很好的回忆起现在的生活。<br></p>
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<a class="article-title" href="/2017/10/12/前端面试题收录/">前端面试题收录</a>
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<h5 id="1、cookie和session"><a href="#1、cookie和session" class="headerlink" title="1、cookie和session"></a>1、cookie和session</h5><blockquote>
<p>首先，http是无状态的协议。出现session和cookie都是为了解决无状态协议带来的问题。通过session和cookie，后端就知道客户端是谁。服务端为了记录每个用户的行为，创建了特定session保存在服务端。而cookie则是给服务端识别身份用的，每次进行http请求的时候，客户端会带上一个特定的sessionid或者说某个服务端第一次在客户端设置的sessionid。总的来说，session在服务端保存用户信息，依赖于保存在客户端的一个sessionid、而cookie在客户端保存了用户的信息一般是包含某个sessionid，在http传递时候给服务端用。</p>
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<h5 id="2、解释let暂时性死区和块级作用域"><a href="#2、解释let暂时性死区和块级作用域" class="headerlink" title="2、解释let暂时性死区和块级作用域"></a>2、解释let暂时性死区和块级作用域</h5><blockquote>
<p>let 和 const都有暂时性死区，即当进入它的作用域，它不能被访问（获取或设置）直到执行到达声明。<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div></pre></td><td class="code"><pre><div class="line"></div><div class="line"><span class="keyword">if</span> (<span class="literal">true</span>) {</div><div class="line"> <span class="built_in">console</span>.log(a)</div><div class="line"> <span class="keyword">let</span> a</div><div class="line"> a =<span class="string">'LOL'</span></div><div class="line">}</div><div class="line"><span class="comment">// 报错: VM1285:2 Uncaught ReferenceError: c is not defined</span></div><div class="line"><span class="keyword">if</span> (<span class="literal">true</span>) {</div><div class="line"> <span class="built_in">console</span>.log(b)</div><div class="line"> <span class="keyword">let</span> b</div><div class="line"> b =<span class="string">'LOL'</span></div><div class="line">}</div><div class="line"><span class="comment">// LOL</span></div></pre></td></tr></table></figure></p>
<p>let块级作用域会在包围他的地方形成作用域，在作用域内，声明的变量不会覆盖作用域外的变量，并且只能声明一个同样的变量。</p>
</blockquote>
<h4 id="3、工厂模式、策略模式、装饰者模式"><a href="#3、工厂模式、策略模式、装饰者模式" class="headerlink" title="3、工厂模式、策略模式、装饰者模式"></a>3、工厂模式、策略模式、装饰者模式</h4><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div></pre></td><td class="code"><pre><div class="line"></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">Who</span> (<span class="params">name</span>) </span>{</div><div class="line"> <span class="keyword">this</span>.name = name</div><div class="line"> <span class="keyword">let</span> person = <span class="keyword">new</span> <span class="built_in">Object</span>()</div><div class="line"> person.name = <span class="string">'name'</span></div><div class="line"> person.age = <span class="string">'age'</span></div><div class="line"> <span class="keyword">return</span> person</div><div class="line">}</div><div class="line">Who.prototype.sayName = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>{</div><div class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name)</div><div class="line">}</div><div class="line"><span class="keyword">let</span> leacent = Who(<span class="string">'leacent'</span>,<span class="string">'18'</span>)</div><div class="line"><span class="built_in">console</span>.log(leacent)</div><div class="line"><span class="comment">// leacent</span></div><div class="line"></div><div class="line"><span class="comment">// 构造函数模式</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">Person</span>(<span class="params">name, age, job</span>)</span>{</div><div class="line"><span class="keyword">this</span>.name = name;</div><div class="line"><span class="keyword">this</span>.age = age;</div><div class="line"><span class="keyword">this</span>.job = job;</div><div class="line"><span class="keyword">this</span>.sayName = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>{</div><div class="line">alert(<span class="keyword">this</span>.name);</div><div class="line">};</div><div class="line">}</div><div class="line"><span class="keyword">var</span> person1 = <span class="keyword">new</span> Person(<span class="string">"Nicholas"</span>, <span class="number">29</span>, <span class="string">"Software Engineer"</span>);</div><div class="line"><span class="keyword">var</span> person2 = <span class="keyword">new</span> Person(<span class="string">"Greg"</span>, <span class="number">27</span>, <span class="string">"Doctor"</span>);</div></pre></td></tr></table></figure>
<h5 id="策略模式"><a href="#策略模式" class="headerlink" title="策略模式"></a>策略模式</h5><p style="color: red; font-size: 16px">策略模式是指对一系列的算法定义，并将每一个算法封装起来，而且使它们还可以相互替换。策略模式让算法独立于使用它的客户而独立变化。</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">let</span> Greeter = <span class="function">(<span class="params">strategy</span>) =></span> {</div><div class="line"> <span class="keyword">this</span>.strategy = strategy</div><div class="line">}</div><div class="line"><span class="keyword">let</span> Strategy = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>{}</div><div class="line">Strategy.prototype.execute = <span class="function"><span class="params">()</span> =></span> {</div><div class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">Error</span>(<span class="string">'Strategy#execute needs to be overridden.'</span>)</div><div class="line">}</div><div class="line"><span class="keyword">let</span> GreetingStrategy = <span class="function"><span class="params">()</span> =></span> {}</div><div class="line">GreetingStrategy.prototype = <span class="built_in">Object</span>.create(Strategy.prototype)</div><div class="line"></div><div class="line">GreetingStrategy.prototype.execute = <span class="function"><span class="params">()</span> =></span> {</div><div class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.sayHi() + <span class="keyword">this</span>.sayBye()</div><div class="line">}</div><div class="line">GreetingStrategy.prototype.sayHi = <span class="function"><span class="params">()</span> =></span> {</div><div class="line"> <span class="keyword">return</span> <span class="string">'Hello, '</span></div><div class="line">}</div><div class="line">GreetingStrategy.prototype.sayBye = <span class="function"><span class="params">()</span> =></span> {</div><div class="line"> <span class="keyword">return</span> <span class="string">'Goodbye, '</span></div><div class="line">}</div><div class="line">Greeter.prototype.greet = <span class="function"><span class="params">()</span> =></span> {</div><div class="line"> <span class="keyword">return</span> <span class="keyword">this</span>.strategy.execute()</div><div class="line">}</div><div class="line"><span class="keyword">let</span> greeter = <span class="keyword">new</span> Greeter(<span class="keyword">new</span> GreetingStrategy())</div><div class="line"></div><div class="line">greeter.greet() <span class="comment">//=> 'Hello, Goodbye.'</span></div><div class="line"></div><div class="line"><span class="keyword">let</span> PoliteGreetingStrategy = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>{}</div><div class="line">PoliteGreetingStrategy.prototype = <span class="built_in">Object</span>.create(GreetingStrategy.prototype)</div><div class="line">PoliteGreetingStrategy.prototype.sayHi = <span class="function"><span class="params">()</span> =></span> {</div><div class="line"> <span class="keyword">return</span> <span class="string">"Welcome sir, "</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">let</span> FriendlyGreetingStrategy = <span class="function"><span class="params">()</span> =></span> {}</div><div class="line">FriendlyGreetingStrategy.prototype = <span class="built_in">Object</span>.create(GreetingStrategy.prototype)</div><div class="line">FriendlyGreetingStrategy.prototype.sayHi = <span class="function"><span class="params">()</span> =></span> {</div><div class="line"> <span class="keyword">return</span> <span class="string">"Hey, "</span></div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">let</span> politeGreeter = <span class="keyword">new</span> Greeter(<span class="keyword">new</span> PoliteGreetingStrategy())</div><div class="line"><span class="keyword">let</span> friendlyGreeter = <span class="keyword">new</span> Greeter(<span class="keyword">new</span> FriendlyGreetingStrategy())</div><div class="line">politeGreeter.greet() <span class="comment">//=> 'Welcome sir, Goodbye.'</span></div><div class="line">friendlyGreeter.greet() <span class="comment">//=> 'Hey, Goodbye.'</span></div></pre></td></tr></table></figure>
<h4 id="4、jsonp"><a href="#4、jsonp" class="headerlink" title="4、jsonp"></a>4、jsonp</h4><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">let</span> url = <span class="string">"http://www.example.net/api?callback=getName"</span></div><div class="line"><span class="keyword">var</span> script = <span class="built_in">document</span>.createElement(<span class="string">"script"</span>)</div><div class="line">script.src = url; <span class="built_in">document</span>.body.appendChild(script)</div><div class="line"><script></div><div class="line"> getName = <span class="function">(<span class="params">name, age</span>) =></span> {</div><div class="line"> name && <span class="built_in">window</span>.name = name</div><div class="line"> age && <span class="built_in">window</span>.age = age</div><div class="line"> }</div><div class="line"><<span class="regexp">/script></span></div></pre></td></tr></table></figure>
<h4 id="5、获取浏览器URL中查询字符串中的参数"><a href="#5、获取浏览器URL中查询字符串中的参数" class="headerlink" title="5、获取浏览器URL中查询字符串中的参数"></a>5、获取浏览器URL中查询字符串中的参数</h4><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">showWindowHref</span>(<span class="params"></span>)</span>{</div><div class="line"> <span class="keyword">var</span> sHref = <span class="built_in">window</span>.location.href;</div><div class="line"> <span class="keyword">var</span> args = sHref.split(<span class="string">'?'</span>);</div><div class="line"> <span class="keyword">if</span>(args[<span class="number">0</span>] == sHref){</div><div class="line"> <span class="keyword">return</span> <span class="string">""</span>;</div><div class="line"> }</div><div class="line"> <span class="keyword">var</span> arr = args[<span class="number">1</span>].split(<span class="string">'&'</span>);</div><div class="line"> <span class="keyword">var</span> obj = {};</div><div class="line"> <span class="keyword">for</span>(<span class="keyword">var</span> i = <span class="number">0</span>;i< arr.length;i++){</div><div class="line"> <span class="keyword">var</span> arg = arr[i].split(<span class="string">'='</span>);</div><div class="line"> obj[arg[<span class="number">0</span>]] = arg[<span class="number">1</span>];</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> obj;</div><div class="line">}</div><div class="line"><span class="keyword">var</span> href = showWindowHref(); <span class="comment">// obj</span></div><div class="line"><span class="built_in">console</span>.log(href[<span class="string">'name'</span>]); <span class="comment">// xiaoming</span></div></pre></td></tr></table></figure>
<h4 id="6、-typeof和instanceof"><a href="#6、-typeof和instanceof" class="headerlink" title="6、 typeof和instanceof"></a>6、 typeof和instanceof</h4><blockquote>
<p>相同点：JavaScript 中 typeof 和 instanceof 常用来判断一个变量是否为空，或者是什么类型的。<br>typeof的定义和用法：返回值是一个字符串，用来说明变量的数据类型。<br>Instanceof定义和用法：instanceof 用于判断一个变量是否属于某个对象的实例。</p>
<p>(1)、typeof 一般只能返回如下几个结果：number,boolean,string,function,object,undefined。</p>
<p>(2)、typeof 来获取一个变量是否存在，如 if(typeof a!=”undefined”){alert(“ok”)}，而不要去使用 if(a) 因为如果 a 不存在（未声明）则会出错。</p>
<p>(3)、对于 Array,Null 等特殊对象使用 typeof 一律返回 object，这正是 typeof 的局限性。</p>
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<p style='color: #666;font-size:14px;font-weight:200;line-height:1.8;-webkit-font-smoothing:antialiased'><br> 发现一种方法，会让浮躁的自己立刻平静下来，然后内心充满着一股故作平静的气息，脑子里萦绕各种思考。<br>是的，只要我在安静点的深夜，喝上泡的绿茶、听着合适的音乐，想着过去的生活。瞬间可以把自己拉到另外境界。<br>仿佛另一种境界外的我在俯视着现在的自己。一种清晰的恍悟，或者深刻的反省可以突然收获。<br>我真的是个贪心又不实际的人，什么事情都想做的很好，却总是无法付出相应的努力。<br>想要写很厉害的代码、想要把歌唱的很好听、想要富有享受物质上自由自在的生活、想要环游世界、看很多书感受很多文化做一个精神丰富的人、想得真的很多。。。<br>但是没什么行为能给我底气，让我对这些梦想的实现深以为然。<br><br>两杯茶过后，似乎反省后的自己已重获新生，换发新生命。。。<br>
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<p>刚刚下去和华古喝了一杯咖啡。。。他刚好在我公司附近面试。web性能优化几乎是大公司最经常面试的，一个是考察面试者web开发的深度，另一方面Web性能优化确实很重要。忽然感悟我也要整理下，总结下。。。。</p>
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<a href="javascript:void(0)" class="js-tag color5">life</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">code</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">about</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">novel</a>
</li>
<div class="clearfix"></div>
</ul>
</div>
<ul class="search-ul">
<p q-show="jsonFail" style="padding: 20px; font-size: 12px;">
缺失模块。<br/>1、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
2、在根目录_config.yml里添加配置：
<pre style="font-size: 12px;" q-show="jsonFail">
jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
text: true
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre>
</p>
<li class="search-li" q-repeat="items" q-show="isShow">
<a q-attr="href:path|urlformat" class="search-title"><i class="icon-quo-left icon"></i><span q-text="title"></span></a>
<p class="search-time">
<i class="icon-calendar icon"></i>
<span q-text="date|dateformat"></span>
</p>
<p class="search-tag">
<i class="icon-price-tags icon"></i>
<span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span>
</p>
</li>
</ul>
</section>
<section class="tools-section tools-section-me" q-show="aboutme">
</section>
</div>
</div>
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
<!-- Background of PhotoSwipe.
It's a separate element as animating opacity is faster than rgba(). -->
<div class="pswp__bg"></div>
<!-- Slides wrapper with overflow:hidden. -->
<div class="pswp__scroll-wrap">
<!-- Container that holds slides.
PhotoSwipe keeps only 3 of them in the DOM to save memory.
Don't modify these 3 pswp__item elements, data is added later on. -->
<div class="pswp__container">
<div class="pswp__item"></div>
<div class="pswp__item"></div>
<div class="pswp__item"></div>
</div>
<!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
<div class="pswp__ui pswp__ui--hidden">
<div class="pswp__top-bar">
<!-- Controls are self-explanatory. Order can be changed. -->
<div class="pswp__counter"></div>
<button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
<button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>
<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
<!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->