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<article id="post-JavaScript函数式编程—数组方法" class="article article-type-post " itemscope itemprop="blogPost">
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<h1 class="article-title" itemprop="name">
JavaScript 函数式编程—数组方法
</h1>
<a href="/JavaScript函数式编程—数组方法/" class="archive-article-date">
<time datetime="2016-09-23T10:59:11.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2016-09-23</time>
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<h1>背景</h1>
<hr>
<p>闲逛的时候发现一个有趣的网站，<a href="http://kangax.github.io/compat-table/es5/" target="_blank" rel="noopener">ECMAScript</a> 里面介绍了各种JS引擎和Node版本对JavaScript特性的支持，从ECMAScript5开始到未来2017将会有的特性。 ES5是JavaScript历史上最具革命的一个版本，开发者们开始摒弃对旧版本 IE 浏览器的支持，使用统一的风格编写JavaScript，并且新的ECMAScript规范也开始启动。目前几乎所有的浏览器环境和Node.JS环境都支持ES5。</p>
<a id="more"></a>
<p>本文将介绍在JavaScript函数式编程中最常使用的几个数组方法，这些我们都习以为常的方法，来自<a href="http://kangax.github.io/compat-table/es5/" target="_blank" rel="noopener">ES5</a><br>
ES5中一共有10个数组方法。</p>
<p>从后面的全绿我们可以知道，ES5的标准以及普及，以上这些方法可以放心使用。<br>
下面是JavaScript函数式编程最常见的三个方法：filter、 map、 reduce。</p>
<h1>Array.prototype.filter()</h1>
<p>filter方法用于对数组进行条件过滤</p>
<p>不用 filter() 时</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><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">'use strict'</span>;</span><br><span class="line"><span class="keyword">let</span> arr = [</span><br><span class="line"> {<span class="string">"name"</span>:<span class="string">"apple"</span>, <span class="string">"count"</span>: <span class="number">2</span>},</span><br><span class="line"> {<span class="string">"name"</span>:<span class="string">"orange"</span>, <span class="string">"count"</span>: <span class="number">5</span>},</span><br><span class="line"> {<span class="string">"name"</span>:<span class="string">"pear"</span>, <span class="string">"count"</span>: <span class="number">3</span>},</span><br><span class="line"> {<span class="string">"name"</span>:<span class="string">"orange"</span>, <span class="string">"count"</span>: <span class="number">16</span>},</span><br><span class="line">];</span><br><span class="line"> </span><br><span class="line"><span class="keyword">let</span> newArr = [];</span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span>(<span class="keyword">let</span> i <span class="keyword">of</span> arr){</span><br><span class="line"> <span class="keyword">if</span>(i.name === <span class="string">"orange"</span> ){</span><br><span class="line"> newArr.push(i);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">"Filter results:"</span>, newArr);</span><br></pre></td></tr></table></figure>
<p>使用filter()</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="meta">'use strict'</span>;</span><br><span class="line"><span class="keyword">let</span> arr = [</span><br><span class="line"> {<span class="string">"name"</span>:<span class="string">"apple"</span>, <span class="string">"count"</span>: <span class="number">2</span>},</span><br><span class="line"> {<span class="string">"name"</span>:<span class="string">"orange"</span>, <span class="string">"count"</span>: <span class="number">5</span>},</span><br><span class="line"> {<span class="string">"name"</span>:<span class="string">"pear"</span>, <span class="string">"count"</span>: <span class="number">3</span>},</span><br><span class="line"> {<span class="string">"name"</span>:<span class="string">"orange"</span>, <span class="string">"count"</span>: <span class="number">16</span>},</span><br><span class="line">];</span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> newArr = arr.filter(<span class="function">(<span class="params">item</span>) =></span> {</span><br><span class="line"> <span class="keyword">return</span> item.name === <span class="string">'orange'</span>;</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">"Filter results:"</span>, newArr);</span><br></pre></td></tr></table></figure>
<h2>Polyfill（兼容旧版浏览器）</h2>
<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><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (!<span class="built_in">Array</span>.prototype.filter) {</span><br><span class="line"> <span class="built_in">Array</span>.prototype.filter = <span class="function"><span class="keyword">function</span>(<span class="params">fun<span class="regexp">/*, thisArg*/</span></span>) </span>{</span><br><span class="line"><span class="meta"> 'use strict'</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span> === <span class="keyword">void</span> <span class="number">0</span> || <span class="keyword">this</span> === <span class="literal">null</span>) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">TypeError</span>();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">var</span> t = <span class="built_in">Object</span>(<span class="keyword">this</span>);</span><br><span class="line"> <span class="keyword">var</span> len = t.length >>> <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">typeof</span> fun !== <span class="string">'function'</span>) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">TypeError</span>();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">var</span> res = [];</span><br><span class="line"> <span class="keyword">var</span> thisArg = <span class="built_in">arguments</span>.length >= <span class="number">2</span> ? <span class="built_in">arguments</span>[<span class="number">1</span>] : <span class="keyword">void</span> <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">for</span> (<span class="keyword">var</span> i = <span class="number">0</span>; i < len; i++) {</span><br><span class="line"> <span class="keyword">if</span> (i <span class="keyword">in</span> t) {</span><br><span class="line"> <span class="keyword">var</span> val = t[i];</span><br><span class="line"> <span class="keyword">if</span> (fun.call(thisArg, val, i, t)) {</span><br><span class="line"> res.push(val);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> res;</span><br><span class="line"> };</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h1>Array.prototype.map()</h1>
<p>你可以把map当做一个 <strong>for each</strong> 循环来使用，它对数组中的每一个元素操作后，返回新的数组。<br>
下面是我们经常会写的循环代码：</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> nums = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];</span><br><span class="line"><span class="keyword">let</span> newNums = [];</span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span>(<span class="keyword">let</span> i = <span class="number">0</span>; i < nums.length; i++) {</span><br><span class="line"> newNums[i] = nums[i] * <span class="number">2</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(newNums); <span class="comment">// [2, 4, 6, 8]</span></span><br></pre></td></tr></table></figure>
<p>我们可以使用ES5中加入的forEach()方法进行改进：</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> nums = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];</span><br><span class="line"><span class="keyword">let</span> newNums = [];</span><br><span class="line"></span><br><span class="line">nums.forEach(<span class="function">(<span class="params">num, index</span>) =></span> {</span><br><span class="line"> newNums[index] = num * <span class="number">2</span>;</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(newNums); <span class="comment">// [2, 4, 6, 8]</span></span><br></pre></td></tr></table></figure>
<p>注意ES5还不支持Arrow Function <strong>()=>{}</strong> 和 <strong>let</strong></p>
<p>不过这样改进以后似乎也没有省多少代码<br>
下面我们看一下比较函数式编程的map方法</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></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> nums = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];</span><br><span class="line"><span class="keyword">let</span> newNums = nums.map(<span class="function">(<span class="params">num</span>) =></span> {</span><br><span class="line"> <span class="keyword">return</span> num * <span class="number">2</span>;</span><br><span class="line">})</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(newNums); <span class="comment">// [2, 4, 6, 8]</span></span><br></pre></td></tr></table></figure>
<p>似不似瞬间代码少了很多呢，下面我们来看下map的源码。</p>
<h2>Polyfill（兼容旧版浏览器）</h2>
<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><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (!<span class="built_in">Array</span>.prototype.map) {</span><br><span class="line"> <span class="built_in">Array</span>.prototype.map = <span class="function"><span class="keyword">function</span>(<span class="params">callback, thisArg</span>) </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">var</span> T, A, k;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span> == <span class="literal">null</span>) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">TypeError</span>(<span class="string">' this is null or not defined'</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">var</span> O = <span class="built_in">Object</span>(<span class="keyword">this</span>);</span><br><span class="line"> <span class="keyword">var</span> len = O.length >>> <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">typeof</span> callback !== <span class="string">'function'</span>) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">TypeError</span>(callback + <span class="string">' is not a function'</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="built_in">arguments</span>.length > <span class="number">1</span>) {</span><br><span class="line"> T = thisArg;</span><br><span class="line"> }</span><br><span class="line"> A = <span class="keyword">new</span> <span class="built_in">Array</span>(len);</span><br><span class="line"> k = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">while</span> (k < len) {</span><br><span class="line"> <span class="keyword">var</span> kValue, mappedValue;</span><br><span class="line"> <span class="keyword">if</span> (k <span class="keyword">in</span> O) {</span><br><span class="line"> kValue = O[k];</span><br><span class="line"> mappedValue = callback.call(T, kValue, k, O);</span><br><span class="line"> A[k] = mappedValue;</span><br><span class="line"> }</span><br><span class="line"> k++;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> A;</span><br><span class="line"> };</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h1>Array.prototype.reduce()</h1>
<blockquote>
<p>arr.reduce(callback, initialValue)</p>
</blockquote>
<p>reduce函数传入两个参数: 第一个是回调函数，第二个是初始化值（可选）。<br>
回调函数里面可以传入四个参数： previousValue， currentValue， currentIndex， array</p>
<p>先看一个求数组最大值的简单例子：</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></pre></td><td class="code"><pre><span class="line"><span class="meta">'use strict'</span>;</span><br><span class="line"><span class="keyword">let</span> maxCallback = <span class="function">(<span class="params">pre, cur</span>) =></span> <span class="built_in">Math</span>.max(pre, cur);</span><br><span class="line"><span class="keyword">let</span> max = [<span class="number">2</span>, <span class="number">33</span>, <span class="number">12</span>, <span class="number">22</span>].reduce(maxCallback);</span><br><span class="line"><span class="built_in">console</span>.log(max); <span class="comment">//33</span></span><br></pre></td></tr></table></figure>
<p>“max =” 右边的执行顺序是怎样的呢？</p>
<ol>
<li>pre = 2, cur = 33, Math.max(pre, cur) = 33</li>
<li>pre = 33, cur = 12, Math.max(pre, cur) = 33</li>
<li>pre = 33, cur = 22, Math.max(pre, cur) = 33<br>
最后 max = 33</li>
</ol>
<p>如果initialValue不为null，则会将initialValue作为函数第一次计算的pre传入：</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></pre></td><td class="code"><pre><span class="line"><span class="meta">'use strict'</span>;</span><br><span class="line"><span class="keyword">let</span> arr = [</span><br><span class="line"> [<span class="number">0</span>, <span class="number">1</span>],</span><br><span class="line"> [<span class="number">2</span>, <span class="number">3</span>],</span><br><span class="line"> [<span class="number">4</span>, <span class="number">5</span>]</span><br><span class="line">];</span><br><span class="line"><span class="keyword">let</span> flattened = arr.reduce(<span class="function"><span class="keyword">function</span>(<span class="params">a, b</span>) </span>{</span><br><span class="line"> <span class="keyword">return</span> a.concat(b);</span><br><span class="line">}, [<span class="number">-1</span>]);</span><br><span class="line"></span><br><span class="line"><span class="built_in">console</span>.log(flattened); <span class="comment">// [ -1, 0, 1, 2, 3, 4, 5 ]</span></span><br></pre></td></tr></table></figure>
<p>计算顺序为：</p>
<ol>
<li>pre = [-1], cur = [0 ,1], return [-1].concat([0, 1]) = [-1, 0, 1]</li>
<li>pre = [-1, 0, 1], cur = [2, 3], return [-1, 0, 1, 2, 3]</li>
<li>pre = [-1, 0, 1, 2, 3], cur = [4, 5], return [ -1, 0, 1, 2, 3, 4, 5 ]</li>
</ol>
<p>利用reduce函数可以简化代码，比如求和：</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">arr.reduce(<span class="function">(<span class="params">a, b</span>) =></span>{</span><br><span class="line"> <span class="keyword">return</span> a + b;</span><br><span class="line">});</span><br></pre></td></tr></table></figure>
<p>求最大值：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">arr.reduce(<span class="function">(<span class="params">pre, cur</span>) =></span> <span class="built_in">Math</span>.max(pre, cur));</span><br></pre></td></tr></table></figure>
<p>把数组转换为对象（数组去重）：</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></pre></td><td class="code"><pre><span class="line">arr.reduce(<span class="function">(<span class="params">o, v</span>) =></span> {</span><br><span class="line"> o[v] = <span class="number">1</span>;</span><br><span class="line"> <span class="keyword">return</span> o;</span><br><span class="line">}, {});</span><br></pre></td></tr></table></figure>
<h2>Polyfill</h2>
<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><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (!<span class="built_in">Array</span>.prototype.reduce) {</span><br><span class="line"> <span class="built_in">Array</span>.prototype.reduce = <span class="function"><span class="keyword">function</span>(<span class="params">callback <span class="regexp">/*, initialValue*/</span></span>) </span>{</span><br><span class="line"><span class="meta"> 'use strict'</span>;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span> === <span class="literal">null</span>) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">TypeError</span>(<span class="string">'Array.prototype.reduce called on null or undefined'</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">typeof</span> callback !== <span class="string">'function'</span>) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">TypeError</span>(callback + <span class="string">' is not a function'</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">var</span> t = <span class="built_in">Object</span>(<span class="keyword">this</span>), len = t.length >>> <span class="number">0</span>, k = <span class="number">0</span>, value;</span><br><span class="line"> <span class="keyword">if</span> (<span class="built_in">arguments</span>.length == <span class="number">2</span>) {</span><br><span class="line"> value = <span class="built_in">arguments</span>[<span class="number">1</span>];</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">while</span> (k < len && !(k <span class="keyword">in</span> t)) {</span><br><span class="line"> k++; </span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (k >= len) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">TypeError</span>(<span class="string">'Reduce of empty array with no initial value'</span>);</span><br><span class="line"> }</span><br><span class="line"> value = t[k++];</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">for</span> (; k < len; k++) {</span><br><span class="line"> <span class="keyword">if</span> (k <span class="keyword">in</span> t) {</span><br><span class="line"> value = callback(value, t[k], k, t);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> value;</span><br><span class="line"> };</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">$digest</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">$apply</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">Big Data</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">Hadoop</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">animation</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">动画</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">transform</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">变形</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">transition</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">过渡</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">CSS Modules</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">webpack</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">vue</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">CSS</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">伪元素</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">before</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">after</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">清除浮动</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">DOM</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">事件流</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">HTML</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">事件委托/代理</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">ES8</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">ES2016</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">ES2017</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">ES2018</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">ES9</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">Express</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">W3C</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">Fetch API</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">flex</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">css</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">居中</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">总结</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">跳槽</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">Gulp</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Babel</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">streaming</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">HTML5</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">meta</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">HTTP</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">301</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">302</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">Transfer-Encoding</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">HTTP2</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">HTTPS</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">SSL/TLS</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">TCP</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">Loop</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">async/await</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">内存泄漏</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">Memory Leaks</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">Hash</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">Symbol</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">prototype</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">原型</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">BOM</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">Object</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">let</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">const</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">ES6</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">TDZ</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">this</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">Scoping</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">Hoisting</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">GC</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">V8</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">数据类型</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">typeof</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">CommonJS</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">AMD</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">CMD</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">clone</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">深拷贝</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">浅拷贝</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">lodash</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">面向对象</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Object-Oriented</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">继承</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">闭包</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">Koa</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">node</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">权限</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">MongDB</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">配置文件</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">Hexo</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Music</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Video</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">进程</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">defineProperty</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">Oracle</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">listagg</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">Pandas</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">PostCSS</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">协程</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">Coroutine</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">RegExp</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">快速排序</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">水桶问题</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">React</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Hooks</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">CDN</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">intergrity</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Shell</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Spark</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Scala</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">RDD</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">xss</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">csrf</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">GPU</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color4">DNS</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">HttpDNS</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">LDNS</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Cache</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">重绘</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">回流</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">首屏</a>
</li>
<li class="article-tag-list-item">