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<h1 id="Pipeable-Operators"><a href="#Pipeable-Operators" class="headerlink" title="Pipeable Operators"></a>Pipeable Operators</h1><p>从版本5.5开始,我们发布了”pipe operators”,可以直接在<code>rxjs/operators</code>访问操作符。 与<code>rxjs/ add/operator/*</code>中的操作符相比,这仅仅是一种更好的方法来引入所需的操作符。</p>
<p><strong>注意</strong>:通过<code>rxjs/operators</code>引入的操作符,如果你的构建程序不更改配置的话,最后打包的文件会变大,不过没关系,<strong>Known Issues</strong>部分会给出解决办法。</p>
<p><strong>改名的操作符</strong></p>
<p>由于操作符可独立于Observable对象使用,操作符不能与JavaScript关键字冲突。 因此对某些操作符的可移植版本的名称进行更改。 有以下操作符:</p>
<ol>
<li><code>do</code> -> <code>tap</code></li>
<li><code>catch</code> -> <code>catchError</code></li>
<li><code>switch</code> -> <code>switchAll</code></li>
<li><code>finally</code> -> <code>finalize</code></li>
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<h1 id="对象"><a href="#对象" class="headerlink" title="对象"></a>对象</h1><h2 id="对象使用和属性"><a href="#对象使用和属性" class="headerlink" title="对象使用和属性"></a>对象使用和属性</h2><p>JavaScript 中所有变量都可以当作对象使用,除了两个例外 <code>null</code> 和 <code>undefined</code>。</p>
<figure class="highlight js"><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="literal">false</span>.toString(); <span class="comment">// 'false'</span></span><br><span class="line">[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].toString(); <span class="comment">// '1,2,3'</span></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Foo</span>(<span class="params"></span>)</span>{}</span><br><span class="line">Foo.bar = <span class="number">1</span>;</span><br><span class="line">Foo.bar; <span class="comment">// 1</span></span><br></pre></td></tr></table></figure>
<p>一个常见的误解是数字的字面值(literal)不能当作对象使用。这是因为 JavaScript 解析器的一个错误, 它试图将点操作符解析为浮点数字面值的一部分。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">2.</span>toString(); <span class="comment">// 出错:SyntaxError</span></span><br></pre></td></tr></table></figure>
<p>有很多变通方法可以让数字的字面值看起来像对象。</p>
<figure class="highlight js"><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="number">2.</span>.toString(); <span class="comment">// 第二个点号可以正常解析</span></span><br><span class="line"><span class="number">2</span> .toString(); <span class="comment">// 注意点号前面的空格</span></span><br><span class="line">(<span class="number">2</span>).toString(); <span class="comment">// 2先被计算</span></span><br></pre></td></tr></table></figure>
<h2 id="对象作为数据类型"><a href="#对象作为数据类型" class="headerlink" title="对象作为数据类型"></a>对象作为数据类型</h2><p>JavaScript 的对象可以作为哈希表使用,主要用来保存命名的键与值的对应关系。</p>
<p>使用对象的字面语法 - {} - 可以创建一个简单对象。这个新创建的对象从 Object.prototype 继承下面,没有任何自定义属性。</p>
<figure class="highlight js"><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">var</span> foo = {}; <span class="comment">// 一个空对象</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 一个新对象,拥有一个值为12的自定义属性'test'</span></span><br><span class="line"><span class="keyword">var</span> bar = {<span class="attr">test</span>: <span class="number">12</span>};</span><br></pre></td></tr></table></figure>
<h2 id="访问属性"><a href="#访问属性" class="headerlink" title="访问属性"></a>访问属性</h2><p>有两种方式来访问对象的属性,点操作符或者中括号操作符。</p>
<figure class="highlight js"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> foo = {<span class="attr">name</span>: <span class="string">'kitten'</span>}</span><br><span class="line">foo.name; <span class="comment">// kitten</span></span><br><span class="line">foo[<span class="string">'name'</span>]; <span class="comment">// kitten</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> get = <span class="string">'name'</span>;</span><br><span class="line">foo[get]; <span class="comment">// kitten</span></span><br><span class="line"></span><br><span class="line">foo<span class="number">.1234</span>; <span class="comment">// SyntaxError</span></span><br><span class="line">foo[<span class="string">'1234'</span>]; <span class="comment">// works</span></span><br></pre></td></tr></table></figure>
<p>两种语法是等价的,但是中括号操作符在下面两种情况下依然有效</p>
<ul>
<li>动态设置属性</li>
<li>属性名不是一个有效的变量名(译者注:比如属性名中包含空格,或者属性名是 JS 的关键词)</li>
</ul>
<h2 id="删除属性"><a href="#删除属性" class="headerlink" title="删除属性"></a>删除属性</h2><p>删除属性的唯一方法是使用 <code>delete</code> 操作符;设置属性为 <code>undefined</code> 或者 <code>null</code> 并不能真正的删除属性, 而仅仅是移除了属性和值的关联。</p>
<figure class="highlight js"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> obj = {</span><br><span class="line"> bar: <span class="number">1</span>,</span><br><span class="line"> foo: <span class="number">2</span>,</span><br><span class="line"> baz: <span class="number">3</span></span><br><span class="line">};</span><br><span class="line">obj.bar = <span class="literal">undefined</span>;</span><br><span class="line">obj.foo = <span class="literal">null</span>;</span><br><span class="line"><span class="keyword">delete</span> obj.baz;</span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span>(<span class="keyword">var</span> i <span class="keyword">in</span> obj) {</span><br><span class="line"> <span class="keyword">if</span> (obj.hasOwnProperty(i)) {</span><br><span class="line"> <span class="built_in">console</span>.log(i, <span class="string">''</span> + obj[i]);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>上面的输出结果有 <code>bar undefined</code> 和 <code>foo null</code> - 只有 <code>baz</code> 被真正的删除了,所以从输出结果中消失。</p>
<h2 id="属性名的语法"><a href="#属性名的语法" class="headerlink" title="属性名的语法"></a>属性名的语法</h2><figure class="highlight js"><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">var</span> test = {</span><br><span class="line"> <span class="string">'case'</span>: <span class="string">'I am a keyword so I must be notated as a string'</span>,</span><br><span class="line"> <span class="keyword">delete</span>: <span class="string">'I am a keyword too so me'</span> <span class="comment">// 出错:SyntaxError</span></span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<p>对象的属性名可以使用字符串或者普通字符声明。但是由于 JavaScript 解析器的另一个错误设计, 上面的第二种声明方式在 ECMAScript 5 之前会抛出 <code>SyntaxError</code> 的错误。</p>
<p>这个错误的原因是 delete 是 JavaScript 语言的一个关键词;因此为了在更低版本的 JavaScript 引擎下也能正常运行, 必须使用字符串字面值声明方式。</p>
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<h4 id="像操作Storage对象一样操作cookie"><a href="#像操作Storage对象一样操作cookie" class="headerlink" title="像操作Storage对象一样操作cookie"></a>像操作Storage对象一样操作cookie</h4><blockquote>
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<p>document.anchors返回得到的数组是所有具有name属性的a标签集合<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">name</span>=<span class="string">"content"</span>></span>内容<span class="tag"></<span class="name">a</span>></span></span><br></pre></td></tr></table></figure></p>
<p>document.links返回得到的数组是所有具有href属性的a标签和area标签集合<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"http://www.baidu.com target="</span><span class="attr">_blank</span>"></span>百度<span class="tag"></<span class="name">a</span>></span></span><br></pre></td></tr></table></figure></p>
<p>document.getElementsByTagName(“a”)返回得到的数组是所有a标签<br><figure class="highlight html"><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="tag"><<span class="name">a</span> <span class="attr">name</span>=<span class="string">"anchor"</span>></span><span class="tag"></<span class="name">a</span>></span></span><br><span class="line"><span class="tag"><<span class="name">a</span> <span class="attr">href</span>=<span class="string">"anchor"</span>></span><span class="tag"></<span class="name">a</span>></span></span><br><span class="line"><span class="tag"><<span class="name">a</span>></span><span class="tag"></<span class="name">a</span>></span></span><br></pre></td></tr></table></figure></p>
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