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<h1 id="laravel-视图组件、服务注入"><a href="#laravel-视图组件、服务注入" class="headerlink" title="laravel 视图组件、服务注入"></a>laravel 视图组件、服务注入</h1><blockquote>
<p>视图组件就是在视图被渲染前，会被调用的闭包或类方法。如果你想在每次渲染某些视图时绑定数据，视图组件可以帮你把这样的程序逻辑都组织到同一个地方。<br>我们需要在我们的服务提供者中注册一个视图 composer 则应该在 boot 方法中完成。此方法会在所有其它的服务提供者被注册后才被调用，意味着你能访问已经被框架注册的所有其它服务</p>
</blockquote>
<p><strong>请注意，Laravel 没有默认的目录来放置视图组件。你可以随意把它们放到任何地方。</strong><br>你可以创建一个 <code>App\Http\ViewComposers</code> 目录</p>
<figure class="highlight xml"><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></pre></td><td class="code"><pre><span class="line"><span class="php"><span class="meta"><?php</span></span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"><span class="keyword">namespace</span> <span class="title">App</span>\<span class="title">Providers</span>;</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"><span class="keyword">use</span> <span class="title">Illuminate</span>\<span class="title">Support</span>\<span class="title">ServiceProvider</span>;</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"><span class="class"><span class="keyword">class</span> <span class="title">AppServiceProvider</span> <span class="keyword">extends</span> <span class="title">ServiceProvider</span></span></span></span><br><span class="line"><span class="php">{</span></span><br><span class="line"> /**</span><br><span class="line"> * Bootstrap any application services.</span><br><span class="line"> *</span><br><span class="line"> * @return void</span><br><span class="line"><span class="php"> */</span></span><br><span class="line"><span class="php"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">boot</span><span class="params">()</span></span></span></span><br><span class="line"><span class="php"> {</span></span><br><span class="line"> /**</span><br><span class="line"> * 视图 composer 共享后台菜单数据</span><br><span class="line"> * 多个视图共用一个视图组件</span><br><span class="line"><span class="php"> */</span></span><br><span class="line"><span class="php"> view()->composer(</span></span><br><span class="line"><span class="php"> [<span class="string">'layouts.index'</span>,<span class="string">'layouts.blog'</span>, <span class="string">'front.article.detail'</span>, <span class="string">'front.category.list'</span> , <span class="string">'front.index.search'</span>], <span class="string">'App\Http\ViewComposers\SettingsComposer'</span></span></span><br><span class="line"><span class="php"> );</span></span><br><span class="line"><span class="php"> }</span></span><br><span class="line"><span class="php">}</span></span><br></pre></td></tr></table></figure>
<figure class="highlight xml"><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="php"><span class="meta"><?php</span></span></span><br><span class="line"><span class="php"><span class="keyword">namespace</span> <span class="title">App</span>\<span class="title">Http</span>\<span class="title">ViewComposers</span>;</span></span><br><span class="line"><span class="php"><span class="keyword">use</span> <span class="title">Illuminate</span>\<span class="title">View</span>\<span class="title">View</span>;</span></span><br><span class="line"><span class="php"><span class="class"><span class="keyword">class</span> <span class="title">SettingsComposer</span></span></span></span><br><span class="line"><span class="php">{</span></span><br><span class="line"> /**</span><br><span class="line"> * 将数据绑定到视图。</span><br><span class="line"> *</span><br><span class="line"> * @param View $view</span><br><span class="line"> * @return void</span><br><span class="line"><span class="php"> */</span></span><br><span class="line"><span class="php"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">compose</span><span class="params">(View $view)</span></span></span></span><br><span class="line"><span class="php"> {</span></span><br><span class="line"><span class="php"> <span class="comment">// getSettings() 方法如下</span></span></span><br><span class="line"><span class="php"> $view->with(<span class="string">'settings'</span>, getSettings());</span></span><br><span class="line"><span class="php"> }</span></span><br><span class="line"><span class="php">}</span></span><br></pre></td></tr></table></figure>
<p><strong>getSettings() 方法如下</strong></p>
<figure class="highlight php"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">// 这是 laravel 5.3 版本</span></span><br><span class="line"><span class="keyword">if</span>(!function_exists(<span class="string">'getSettings'</span>)){</span><br><span class="line"> <span class="function"><span class="keyword">function</span> <span class="title">getSettings</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> $key = config(<span class="string">'admin.global.blog'</span>);</span><br><span class="line"> </span><br><span class="line"> <span class="comment">// has 方法可以用来检查一个项目是否存在于缓存中</span></span><br><span class="line"> <span class="keyword">if</span> (cache()->has($key)) {</span><br><span class="line"> <span class="keyword">return</span> cache($key);</span><br><span class="line"> }<span class="keyword">else</span>{</span><br><span class="line"> <span class="comment">// 此方法需要安装包 edvinaskrucas/settings</span></span><br><span class="line"> $settings = settings($key,config(<span class="string">'admin.global.setting'</span>));</span><br><span class="line"> <span class="comment">// forever 方法可以用来存放永久的项目到缓存中，这些值必须被手动的删除，这可以通过 forget 方法实现</span></span><br><span class="line"> cache()->forever($key,$settings);</span><br><span class="line"> <span class="keyword">return</span> $settings;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight xml"><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></pre></td><td class="code"><pre><span class="line"><span class="php"><span class="meta"><?php</span></span></span><br><span class="line"><span class="php"><span class="comment">// 这是 laravel 5.2 版本</span></span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"><span class="keyword">use</span> <span class="title">Illuminate</span>\<span class="title">Support</span>\<span class="title">Facades</span>\<span class="title">Cache</span>;</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"><span class="keyword">if</span>(!function_exists(<span class="string">'getSettings'</span>)){</span></span><br><span class="line"><span class="php"> <span class="function"><span class="keyword">function</span> <span class="title">getSettings</span><span class="params">()</span></span></span></span><br><span class="line"><span class="php"> {</span></span><br><span class="line"><span class="php"> $key = config(<span class="string">'admin.global.blog'</span>);</span></span><br><span class="line"><span class="php"></span></span><br><span class="line"><span class="php"> <span class="keyword">if</span> (Cache::has($key)) {</span></span><br><span class="line"><span class="php"> <span class="keyword">return</span> Cache::get($key);</span></span><br><span class="line"><span class="php"> }<span class="keyword">else</span>{</span></span><br><span class="line"><span class="php"> $settings = settings($key,config(<span class="string">'admin.global.setting'</span>));</span></span><br><span class="line"><span class="php"> Cache::forever($key,$settings);</span></span><br><span class="line"><span class="php"> <span class="keyword">return</span> $settings;</span></span><br><span class="line"><span class="php"> }</span></span><br><span class="line"><span class="php"> }</span></span><br><span class="line"><span class="php">}</span></span><br></pre></td></tr></table></figure>
<h2 id="使用"><a href="#使用" class="headerlink" title="使用"></a>使用</h2><figure class="highlight django"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="xml"><span class="meta"><!DOCTYPE html></span></span></span><br><span class="line"><span class="xml"><span class="tag"><<span class="name">html</span> <span class="attr">lang</span>=<span class="string">"en"</span> <span class="attr">class</span>=<span class="string">"no-js"</span>></span></span></span><br><span class="line"><span class="xml"><span class="tag"><<span class="name">head</span>></span></span></span><br><span class="line"><span class="xml"><span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>/></span></span></span><br><span class="line"><span class="xml"><span class="tag"><<span class="name">meta</span> <span class="attr">http-equiv</span>=<span class="string">"X-UA-Compatible"</span> <span class="attr">content</span>=<span class="string">"IE=edge"</span>></span></span></span><br><span class="line"><span class="xml"><span class="tag"><<span class="name">title</span>></span></span><span class="template-variable">{{$settings['title']}}</span><span class="xml"><span class="tag"></<span class="name">title</span>></span></span></span><br><span class="line"><span class="xml"><span class="tag"><<span class="name">meta</span> <span class="attr">name</span>=<span class="string">"keywords"</span> <span class="attr">content</span>=<span class="string">"</span></span></span><span class="template-variable">{{$settings['keywords']}}</span><span class="xml"><span class="tag"><span class="string">"</span> /></span></span></span><br><span class="line"><span class="xml"><span class="tag"><<span class="name">meta</span> <span class="attr">name</span>=<span class="string">"description"</span> <span class="attr">content</span>=<span class="string">"</span></span></span><span class="template-variable">{{$settings['description']}}</span><span class="xml"><span class="tag"><span class="string">"</span>></span></span></span><br><span class="line"><span class="xml"><span class="tag"><<span class="name">meta</span> <span class="attr">name</span>=<span class="string">"author"</span> <span class="attr">content</span>=<span class="string">"</span></span></span><span class="template-variable">{{$settings['author']}}</span><span class="xml"><span class="tag"><span class="string">"</span>></span></span></span><br></pre></td></tr></table></figure>
<h2 id="缓存"><a href="#缓存" class="headerlink" title="缓存"></a>缓存</h2><p><a href="http://d.laravel-china.org/docs/5.2/cache#获取一个缓存的实例" target="_blank" rel="noopener">缓存实例看手册</a><br><a href="https://github.com/illuminate/contracts/blob/master/Cache/Repository.php" target="_blank" rel="noopener">缓存接口</a></p>
<p><strong>源码 cache() 方法如下</strong></p>
<figure class="highlight php"><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><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (! function_exists(<span class="string">'cache'</span>)) {</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Get / set the specified cache value.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * If an array is passed, we'll assume you want to put to the cache.</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@param</span> dynamic key|key,default|data,expiration|null</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@return</span> mixed</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@throws</span> \Exception</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">function</span> <span class="title">cache</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> $arguments = func_get_args(); <span class="comment">// 返回一个包含函数参数列表的数组</span></span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">empty</span>($arguments)) {</span><br><span class="line"> <span class="keyword">return</span> app(<span class="string">'cache'</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (is_string($arguments[<span class="number">0</span>])) {</span><br><span class="line"> <span class="comment">// get 方法可以用来取出缓存中的项目，缓存不存在的话返回 null，get 方法接受第二个参数，作为找不到项目时返回的预设值</span></span><br><span class="line"> <span class="keyword">return</span> app(<span class="string">'cache'</span>)->get($arguments[<span class="number">0</span>], <span class="keyword">isset</span>($arguments[<span class="number">1</span>]) ? $arguments[<span class="number">1</span>] : <span class="keyword">null</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (is_array($arguments[<span class="number">0</span>])) {</span><br><span class="line"> <span class="keyword">if</span> (! <span class="keyword">isset</span>($arguments[<span class="number">1</span>])) {</span><br><span class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> <span class="keyword">Exception</span>(</span><br><span class="line"> <span class="string">'You must set an expiration time when putting to the cache.'</span></span><br><span class="line"> );</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> * put 方法来存放项目到缓存中，你需要使用第三个参数来设定缓存的存放时间</span></span><br><span class="line"><span class="comment"> * key — 从关联数组中取得键名</span></span><br><span class="line"><span class="comment"> * reset — 将数组的内部指针指向第一个单元,取值</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="keyword">return</span> app(<span class="string">'cache'</span>)->put(key($arguments[<span class="number">0</span>]), reset($arguments[<span class="number">0</span>]), $arguments[<span class="number">1</span>]);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="edvinaskrucas-settings"><a href="#edvinaskrucas-settings" class="headerlink" title="edvinaskrucas/settings"></a>edvinaskrucas/settings</h2><p>执行 <code>composer require edvinaskrucas/settings</code><br><a href="https://packagist.org/packages/edvinaskrucas/settings" target="_blank" rel="noopener">包地址</a></p>
<h2 id="服务注入"><a href="#服务注入" class="headerlink" title="服务注入"></a>服务注入</h2><blockquote>
<p>@inject 命令可以取出 Laravel 服务容器 中的服务。传递给 @inject 的第一个参数为置放该服务的变量名称，而第二个参数为你想要解析的服务的类或是接口的名称</p>
</blockquote>
<figure class="highlight elixir"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable">@inject</span>(<span class="string">'metrics'</span>, <span class="string">'App\Services\MetricsService'</span>)</span><br><span class="line"></span><br><span class="line"><div></span><br><span class="line"> 每月收入：{{ <span class="variable">$metrics</span>->monthlyRevenue() }}。</span><br><span class="line"><<span class="regexp">/div></span></span><br></pre></td></tr></table></figure>
<h2 id="参考学习"><a href="#参考学习" class="headerlink" title="参考学习"></a>参考学习</h2><p><a href="http://d.laravel-china.org/docs/5.2/views#视图组件" target="_blank" rel="noopener">视图组件</a></p>
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<div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#laravel-视图组件、服务注入"><span class="nav-number">1.</span> <span class="nav-text"><a href="#laravel-视图组件、服务注入" class="headerlink" title="laravel 视图组件、服务注入"></a>laravel 视图组件、服务注入</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#使用"><span class="nav-number">1.1.</span> <span class="nav-text"><a href="#使用" class="headerlink" title="使用"></a>使用</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#缓存"><span class="nav-number">1.2.</span> <span class="nav-text"><a href="#缓存" class="headerlink" title="缓存"></a>缓存</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#edvinaskrucas-settings"><span class="nav-number">1.3.</span> <span class="nav-text"><a href="#edvinaskrucas-settings" class="headerlink" title="edvinaskrucas/settings"></a>edvinaskrucas/settings</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#服务注入"><span class="nav-number">1.4.</span> <span class="nav-text"><a href="#服务注入" class="headerlink" title="服务注入"></a>服务注入</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#参考学习"><span class="nav-number">1.5.</span> <span class="nav-text"><a href="#参考学习" class="headerlink" title="参考学习"></a>参考学习</span></a></li></ol></li></ol></div>
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ds.type = 'text/javascript';ds.async = true;
ds.id = 'duoshuo-script';
ds.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') + '//static.duoshuo.com/embed.js';
ds.charset = 'UTF-8';
(document.getElementsByTagName('head')[0]
|| document.getElementsByTagName('body')[0]).appendChild(ds);
})();
</script>
<script src="/vendors/ua-parser-js/dist/ua-parser.min.js?v=0.7.9"></script>
<script src="/js/src/hook-duoshuo.js"></script>
<script type="text/javascript">
// Popup Window;
var isfetched = false;
// Search DB path;
var search_path = "search.xml";
if (search_path.length == 0) {
search_path = "search.xml";
}
var path = "/" + search_path;
// monitor main search box;
function proceedsearch() {
$("body").append('<div class="popoverlay">').css('overflow', 'hidden');
$('.popup').toggle();
}
// search function;
var searchFunc = function(path, search_id, content_id) {
'use strict';
$.ajax({
url: path,
dataType: "xml",
async: true,
success: function( xmlResponse ) {
// get the contents from search data
isfetched = true;
$('.popup').detach().appendTo('.header-inner');
var datas = $( "entry", xmlResponse ).map(function() {
return {
title: $( "title", this ).text(),
content: $("content",this).text(),
url: $( "url" , this).text()
};
}).get();
var $input = document.getElementById(search_id);
var $resultContent = document.getElementById(content_id);
$input.addEventListener('input', function(){
var matchcounts = 0;
var str='<ul class=\"search-result-list\">';
var keywords = this.value.trim().toLowerCase().split(/[\s\-]+/);
$resultContent.innerHTML = "";
if (this.value.trim().length > 1) {
// perform local searching
datas.forEach(function(data) {
var isMatch = true;
var content_index = [];
var data_title = data.title.trim().toLowerCase();
var data_content = data.content.trim().replace(/<[^>]+>/g,"").toLowerCase();
var data_url = data.url;
var index_title = -1;
var index_content = -1;
var first_occur = -1;
// only match artiles with not empty titles and contents
if(data_title != '' && data_content != '') {
keywords.forEach(function(keyword, i) {
index_title = data_title.indexOf(keyword);
index_content = data_content.indexOf(keyword);
if( index_title < 0 && index_content < 0 ){
isMatch = false;
} else {
if (index_content < 0) {
index_content = 0;
}
if (i == 0) {
first_occur = index_content;
}
}
});
}
// show search results
if (isMatch) {
matchcounts += 1;
str += "<li><a href='"+ data_url +"' class='search-result-title'>"+ data_title +"</a>";
var content = data.content.trim().replace(/<[^>]+>/g,"");
if (first_occur >= 0) {
// cut out 100 characters
var start = first_occur - 20;
var end = first_occur + 80;
if(start < 0){
start = 0;
}
if(start == 0){
end = 50;
}
if(end > content.length){
end = content.length;
}
var match_content = content.substring(start, end);
// highlight all keywords
keywords.forEach(function(keyword){
var regS = new RegExp(keyword, "gi");
match_content = match_content.replace(regS, "<b class=\"search-keyword\">"+keyword+"</b>");
});
str += "<p class=\"search-result\">" + match_content +"...</p>"
}
str += "</li>";
}
})};
str += "</ul>";
if (matchcounts == 0) { str = '<div id="no-result"><i class="fa fa-frown-o fa-5x" /></div>' }
if (keywords == "") { str = '<div id="no-result"><i class="fa fa-search fa-5x" /></div>' }
$resultContent.innerHTML = str;
});
proceedsearch();
}
});}
// handle and trigger popup window;
$('.popup-trigger').click(function(e) {
e.stopPropagation();
if (isfetched == false) {
searchFunc(path, 'local-search-input', 'local-search-result');
} else {
proceedsearch();
};
});
$('.popup-btn-close').click(function(e){
$('.popup').hide();
$(".popoverlay").remove();
$('body').css('overflow', '');
});
$('.popup').click(function(e){
e.stopPropagation();
});
</script>
</body>
<!-- 背景动画 -->
<script type="text/javascript" src="http://api.jybx.me/particle.js"></script>
</html>