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javascript中的apply、call、bind
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<h1 id="apply-与call-的作用"><a href="#apply-与call-的作用" class="headerlink" title="apply()与call()的作用"></a>apply()与call()的作用</h1><p>部分内容引用于<a href="https://www.zhihu.com/question/20289071" target="_blank" rel="external">知乎问题：如何理解和熟练运用js中的call及apply？</a>中杨志和赵望野的回答。</p>
<h2 id="标准说法："><a href="#标准说法：" class="headerlink" title="标准说法："></a>标准说法：</h2><p>call 和 apply 都是为了改变某个函数运行时的 context 即上下文而存在的，换句话说，就是为了改变函数体内部 this 的指向。<br>因为 JavaScript 的函数存在「定义时上下文」和「运行时上下文」以及「上下文是可以改变的」这样的概念。</p>
<p>通俗说法：<br>当有个object 我们不想对他重新定义方法时，可以利用 <code>apply</code> 和 <code>call</code> 来 <strong><em>借用</em></strong> 其他对象的方法。</p>
<h2 id="例子与作用："><a href="#例子与作用：" class="headerlink" title="例子与作用："></a>例子与作用：</h2><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></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">cat</span>(<span class="params"></span>)</span>{</div><div class="line">}</div><div class="line">cat.prototype={</div><div class="line">food:<span class="string">"fish"</span>,</div><div class="line">say: <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>{</div><div class="line">alert(<span class="string">"I love "</span>+<span class="keyword">this</span>.food);</div><div class="line">}</div><div class="line">}</div><div class="line"></div><div class="line"></div><div class="line"><span class="keyword">var</span> blackCat = <span class="keyword">new</span> cat;</div><div class="line">blackCat.say();</div></pre></td></tr></table></figure>
<p>此时有一个对象<code>whiteDog = {food:"bone"}</code>,我们不想对它重新定义<code>say</code>方法，那么我们可以通过<code>call</code>或<code>apply</code>用<code>blackCat</code>的<code>say</code>方法：<code>blackCat.say.call(whiteDog);</code></p>
<p>以及<a href="http://codingme.xyz/2016/09/19/javascript-note-5-3/#apply-与-call-的用武之地">apply与call的用武之地</a></p>
<h1 id="apply-和-call-的异同"><a href="#apply-和-call-的异同" class="headerlink" title="apply 和 call 的异同"></a>apply 和 call 的异同</h1><p>接受参数的不同：</p>
<p>call 将参数按顺序一个一个传递进去;<br>apply 将参数放在数组里。</p>
<h1 id="bind"><a href="#bind" class="headerlink" title="bind"></a>bind</h1><p>一个可以将函数绑定到指定环境的函数。<br>(<a href="http://codingme.xyz/2016/11/07/javascript-note-22-1/#函数绑定">http://codingme.xyz/2016/11/07/javascript-note-22-1/#函数绑定</a>)</p>
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《 JavaScript 高级程序设计》备忘-第二十四章-3
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<h1 id="最佳实践"><a href="#最佳实践" class="headerlink" title="最佳实践"></a>最佳实践</h1><h2 id="性能"><a href="#性能" class="headerlink" title="性能"></a>性能</h2><h3 id="选择正确方法"><a href="#选择正确方法" class="headerlink" title="选择正确方法"></a>选择正确方法</h3><h4 id="避免双重解释"><a href="#避免双重解释" class="headerlink" title="避免双重解释"></a>避免双重解释</h4><p>当JavaScript 代码想解析JavaScript 的时候就会存在双重解释惩罚。<br>当使用eval()函数或者是Function 构造函数以及使用setTimeout()传一个字符串参数时都会发生这种情况。</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></pre></td><td class="code"><pre><div class="line"><span class="comment">//某些代码求值——避免!!</span></div><div class="line"><span class="built_in">eval</span>(<span class="string">"alert('Hello world!')"</span>);</div><div class="line"><span class="comment">//创建新函数——避免!!</span></div><div class="line"><span class="keyword">var</span> sayHi = <span class="keyword">new</span> <span class="built_in">Function</span>(<span class="string">"alert('Hello world!')"</span>);</div><div class="line"><span class="comment">//设置超时——避免!!</span></div><div class="line">setTimeout(<span class="string">"alert('Hello world!')"</span>, <span class="number">500</span>);</div></pre></td></tr></table></figure>
<p>在以上这些例子中，都要解析包含了JavaScript 代码的字符串。<br>这个操作是不能在初始的解析过程中完成的，因为代码是包含在字符串中的，也就是说在JavaScript 代码运行的同时必须新启动一个解析器来解析新的代码。<br>实例化一个新的解析器有不容忽视的开销，所以这种代码要比直接解析慢得多。<br>
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<h1 id="最佳实践"><a href="#最佳实践" class="headerlink" title="最佳实践"></a>最佳实践</h1><h2 id="可维护性"><a href="#可维护性" class="headerlink" title="可维护性"></a>可维护性</h2><h3 id="编程实践"><a href="#编程实践" class="headerlink" title="编程实践"></a>编程实践</h3><h4 id="避免与null-进行比较"><a href="#避免与null-进行比较" class="headerlink" title="避免与null 进行比较"></a>避免与null 进行比较</h4><p>由于JavaScript 不做任何自动的类型检查，所有它就成了开发人员的责任。<br>因此，在JavaScript 代码中其实很少进行类型检测。<br>最常见的类型检测就是查看某个值是否为null。但是，直接将值与null比较是使用过度的，并且常常由于不充分的类型检查导致错误。</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></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">sortArray</span>(<span class="params">values</span>)</span>{</div><div class="line"><span class="keyword">if</span> (values != <span class="literal">null</span>){ <span class="comment">//避免！</span></div><div class="line">values.sort(comparator);</div><div class="line">}</div><div class="line">}</div></pre></td></tr></table></figure>
<p>这里的if 语句仅仅检查该values 是否为null。还有其他的值可以通过if 语句，包括字符串、数字，它们会导致函数抛出错误。<br>现实中，与null 比较很少适合情况而被使用。<br>必须按照所期望的对值进行检查，而非按照不被期望的那些。<br>values 参数应该是一个数组，那么就要检查它是不是一个数组，而不是检查它是否非null。<br>
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