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<!DOCTYPE html>
<html class="theme-next pisces use-motion" lang="zh-Hans">
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<a class="post-title-link" href="/2018/11/14/CORS-浏览器跨域方法/" itemprop="url">CORS-浏览器跨域方法</a></h1>
<div class="post-meta">
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2018-11-14
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<div class="post-body" itemprop="articleBody">
<h2 id="CORS"><a href="#CORS" class="headerlink" title="CORS"></a>CORS</h2><blockquote>
<p>CORS是一个W3C标准,全称是”跨域资源共享”(Cross-origin resource sharing)。</p>
</blockquote>
<h2 id="什么是跨域"><a href="#什么是跨域" class="headerlink" title="什么是跨域"></a>什么是跨域</h2><blockquote>
<p>跨域指的是 通过js在不同的域进行通信或传输数据。比如通过<br><code><img></code> 标签加载其他域的资源图片,<code><script></code> 标签加载其他域的js文件,或者通过js获取页面中不同域的框架中(<code>iframe</code>)的数据。只要域名、协议、端口号有任何一个不同,就属于不同的域。</p>
</blockquote>
<h2 id="跨域方法"><a href="#跨域方法" class="headerlink" title="跨域方法"></a>跨域方法</h2><h3 id="XMLHttpRequest对象"><a href="#XMLHttpRequest对象" class="headerlink" title="XMLHttpRequest对象"></a>XMLHttpRequest对象</h3><blockquote>
<p>通过XHR实现Ajax通信的一个主要限制,来源于跨域安全策略。默认情况下,XHR 对象只能访问与包含它的页面位于同一个域中的资源。但是,浏览器(IE除外)都通过 XMLHttpRequest对象实现了对 CORS 的原生支持。在尝试打开不同来源的资源时,无需额外编写代码就可以触发这个行为。要请求位于另一个域中的资源,使用标准的 XHR对象并在 open() 方法中传入绝对 URL即可。比如:</p>
</blockquote>
<pre><code>var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(){
if (xhr.readyState == 4){
if ((xhr.status >= 200 && xhr.status < 300) || xhr.status== 304){
alert(xhr.responseText);
} else {
alert("Request was unsuccessful: " + xhr.status);
}
}
};
xhr.open("get", "https://jsonplaceholder.typicode.com/users", true);
xhr.send(null);
</code></pre><h3 id="Jsonp跨域"><a href="#Jsonp跨域" class="headerlink" title="Jsonp跨域"></a>Jsonp跨域</h3><blockquote>
<p>通过<code><script></code>标签加载其他域的资源,服务器端设置一个辅助函数配合前端回调函数,返回的是可执行的js把它作为回调函数的参数即可得到我们获取的数据。但缺点是只能进行get方法请求。</p>
</blockquote>
<p><strong>页面代码如下:</strong></p>
<pre><code><!DOCTYPE html>
<html>
<head>
<title>Jsonp</title>
<meta charset="utf-8">
</head>
<body>
<div id="show"></div>
<script type="text/javascript">
function showData(data) {
console.table(data);
}
showData();
</script>
<script type="text/javascript">
window.onload = function(){
let script = document.createElement('script');
script.src = 'https://jsonplaceholder.typicode.com/users'+'?callback=showData';
document.body.appendChild(script);
}
</script>
</body>
</html>
</code></pre><p><strong>Google控制台输出结果</strong></p>
<blockquote>
<p><img src="https://upload-images.jianshu.io/upload_images/11575712-d3802e9e24eddc3b.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="result.png"></p>
</blockquote>
<h3 id="跨文档消息传递"><a href="#跨文档消息传递" class="headerlink" title="跨文档消息传递"></a>跨文档消息传递</h3><blockquote>
<p>跨文档消息传送(cross-document messaging),有时候简称为 XDM,指的是在来自不同域的页面间传递消息。例如,<a href="http://www.aa.com域中的页面与位于一个内嵌框架p2p.aa.com域中的页面通信。" target="_blank" rel="noopener">www.aa.com域中的页面与位于一个内嵌框架p2p.aa.com域中的页面通信。</a></p>
</blockquote>
<hr>
<blockquote>
<p>XDM 的核心方法是PostMessage。在 HTML5 规范中,除了 XDM部分之外的其他部分也会提到这个方法名,但都是为了同一个目的:向另一个地方传递数据。对于 XDM 而言,“另一个地方”指的是包含在当前页面中的 <iframe> 元素,或者由当前页面弹出的窗口。</p>
</blockquote>
<hr>
<blockquote>
<p>postMessage() 方法接收两个参数:一条消息和一个表示消息接收方来自哪个域的字符串。第二个参数对保障安全通信非常重要,可以防止浏览器把消息发送到不安全的地方。<br>接收到 XDM 消息时,会触发 window 对象的 message 事件传递给 onmessage 处理程序的事件对象包含以下三方面的重要信息<br><strong>data</strong> :作为 postMessage() 第一个参数传入的字符串数据。<br><strong>origin</strong> :发送消息的文档所在的域,例如 “<a href="http://www.wrox.com"" target="_blank" rel="noopener">http://www.wrox.com"</a><br><strong>source</strong> :发送消息的文档的 window 对象的代理。这个代理对象主要用于在发送上一条消息的窗口中调用 postMessage() 方法。如果发送消息的窗口来自同一个域,那这个对象就是window </p>
</blockquote>
<hr>
<p><em>在 onmessage 处理程序中检测消息来源可以确保传入的消息来自已知的页面</em><br><strong>检测方法如下</strong></p>
<pre><code>EventUtil.addHandler(window, "message",
function(event){
//确保发送消息的域是已知的域
if (event.origin == "http://www.wrox.com"){
//处理接收到的数据
processMessage(event.data);
//可选:向来源窗口发送回执
event.source.postMessage("Received!", "http://p2p.wrox.com");
}
});
</code></pre>
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<a class="post-title-link" href="/2018/09/23/排序算法总结/" itemprop="url">排序算法总结</a></h1>
<div class="post-meta">
<span class="post-time">
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<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2018-09-23T16:17:23+08:00">
2018-09-23
</time>
</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<h1 id="常用排序算法总结"><a href="#常用排序算法总结" class="headerlink" title="常用排序算法总结"></a>常用排序算法总结</h1><h3 id="插入排序"><a href="#插入排序" class="headerlink" title="插入排序"></a>插入排序</h3><ul>
<li><p>一般方法 :</p>
<blockquote>
<p>在第P趟,将位置P上的元素向左移动到它在前P+1个元素中的正确位置上。对于P=1到P=N-1趟,插入排序保证从位置0到位置P上的元素为已排序状态。</p>
</blockquote>
</li>
<li><p>复杂度 </p>
<blockquote>
<p>最好的情况:数组完全有序,每次插入只需要和插入位置的前一个元素,因此复杂度为O(N);<br>最坏的情况:数组完全逆序,在插入第n个位置时,需要比较前n-1 个,次数为1+2+···+n-1+n=n*(n-1)/2. 因此复杂度为O(n^2).</p>
</blockquote>
</li>
</ul>
<hr>
<p><strong>JavaScript算法实现</strong></p>
<pre><code>function InsertionSort(arr,n) {
var j,p,temp;//p趟插入,n=arr.length时能完全排序
for (p = 1; p < n; p++) {
temp = arr[p];
for(j=p; j>0&&arr[j-1]>temp; j--) {
arr[j] = arr[j-1];
}
arr[j] = temp;
}
return arr;
}
</code></pre><hr>
<h3 id="快速排序"><a href="#快速排序" class="headerlink" title="快速排序"></a>快速排序</h3><ul>
<li><p>算法步骤</p>
<blockquote>
<ol>
<li>如果数组S的元素个数是1或0,则返回。<ol start="2">
<li>取S中任一元素v,作为枢纽 元。</li>
<li>将S-{v} 分为两个不相交的集合:S1={x∊S-{v} | x<=v} 和 S2={x∊S-{v} | x>=v} </li>
<li>返回 { quicksort(s1)后,继而v,进而 quicksort(s2) }</li>
</ol>
</li>
</ol>
</blockquote>
</li>
<li><p>算法分析</p>
<blockquote>
<p>它的平均运行时间为O(N log N),它的最坏性能为O(N^2).</p>
</blockquote>
</li>
<li><p>算法思想以及算法实现</p>
</li>
</ul>
<ol>
<li><p>选取枢纽元</p>
<blockquote>
<p>三中值法:一般方法是选择左端、右端和中心位置上的三个元素中值作为枢纽元</p>
</blockquote>
<pre><code>var media3 = arr[0].concat(pivot,arr.pop()).sort((a,b)=>{return a-b;})[1];
</code></pre><blockquote>
<p>后面用递归法实现s1 . s2 的排序</p>
</blockquote>
<p> function quickSort(arr) {</p>
<pre><code>if(arr.length<=1){
return arr;
}
var pivotIndex = parseInt(arr.length/2);
var pivot = arr[pivotIndex];//直接选取中间值为枢纽元
var left = [];
var right = [];
for(var i=0;i<arr.length;i++) {
if(arr[i]<pivot){
left.push(arr[i]);
}
else{
right.push(arr[i]);
}
}
return quickSort(left).concat(pivot,quickSort(right));
</code></pre><p> }</p>
</li>
</ol>
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