unslug zh-cn: move

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diff --git a/files/zh-cn/web/api/xmlhttprequest/loadend_event/index.html b/files/zh-cn/web/api/xmlhttprequest/loadend_event/index.html
new file mode 100644
index 0000000000..529a0b1673
--- /dev/null
+++ b/files/zh-cn/web/api/xmlhttprequest/loadend_event/index.html
@@ -0,0 +1,89 @@
+---
+title: loadend
+slug: Web/Events/loadend
+translation_of: Web/API/XMLHttpRequest/loadend_event
+---
+<p>loadend事件总是在一个资源的加载进度停止之后被触发 (例如，在已经触发“error”，“abort”或“load”事件之后)。这适用于 {{domxref("XMLHttpRequest")}}调用, 以及{{htmlelement("img")}}或{{htmlelement("video")}}之类元素的内容。</p>
+
+<h2 id="General_info">General info</h2>
+
+<dl>
+ <dt style="float: left; text-align: right; width: 120px;">规范</dt>
+ <dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.w3.org/TR/progress-events/">Progress</a></dd>
+ <dt style="float: left; text-align: right; width: 120px;">接口</dt>
+ <dd style="margin: 0 0 0 120px;">ProgressEvent</dd>
+ <dt style="float: left; text-align: right; width: 120px;">可冒泡</dt>
+ <dd style="margin: 0 0 0 120px;">否</dd>
+ <dt style="float: left; text-align: right; width: 120px;">可取消</dt>
+ <dd style="margin: 0 0 0 120px;">否</dd>
+ <dt style="float: left; text-align: right; width: 120px;">触发对象</dt>
+ <dd style="margin: 0 0 0 120px;">例如{{domxref("HTMLImageElement")}}</dd>
+ <dt style="float: left; text-align: right; width: 120px;">默认行为</dt>
+ <dd style="margin: 0 0 0 120px;">无</dd>
+</dl>
+
+<h2 id="Properties">Properties</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Property</th>
+   <th scope="col">Type</th>
+   <th scope="col">Description</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>target</code> {{readonlyInline}}</td>
+   <td>{{domxref("EventTarget")}}</td>
+   <td>The event target (the topmost target in the DOM tree).</td>
+  </tr>
+  <tr>
+   <td><code>type</code> {{readonlyInline}}</td>
+   <td>{{domxref("DOMString")}}</td>
+   <td>The type of event.</td>
+  </tr>
+  <tr>
+   <td><code>bubbles</code> {{readonlyInline}}</td>
+   <td>{{jsxref("Boolean")}}</td>
+   <td>Whether the event normally bubbles or not.</td>
+  </tr>
+  <tr>
+   <td><code>cancelable</code> {{readonlyInline}}</td>
+   <td>{{jsxref("Boolean")}}</td>
+   <td>Whether the event is cancellable or not.</td>
+  </tr>
+  <tr>
+   <td><code>lengthComputable </code>{{readonlyInline}}</td>
+   <td>{{jsxref("Boolean")}}</td>
+   <td>Specifies whether or not the total size of the transfer is known. Read only.</td>
+  </tr>
+  <tr>
+   <td><code>loaded</code> {{readonlyInline}}</td>
+   <td>unsigned long (long)</td>
+   <td>The number of bytes transferred since the beginning of the operation. This doesn't include headers and other overhead, but only the content itself. Read only.</td>
+  </tr>
+  <tr>
+   <td><code>total</code> {{readonlyInline}}</td>
+   <td>unsigned long (long)</td>
+   <td>The total number of bytes of content that will be transferred during the operation. If the total size is unknown, this value is zero. Read only.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Related_Events">Related Events</h2>
+
+<ul>
+ <li>{{event("loadstart")}}</li>
+ <li>{{event("progress")}}</li>
+ <li>{{event("error")}}</li>
+ <li>{{event("abort")}}</li>
+ <li>{{event("load")}}</li>
+ <li>{{event("loadend")}}</li>
+</ul>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest#Monitoring_progress" title="/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest">Monitoring progress</a></li>
+</ul>
diff --git a/files/zh-cn/web/api/xmlhttprequest/loadstart_event/index.html b/files/zh-cn/web/api/xmlhttprequest/loadstart_event/index.html
new file mode 100644
index 0000000000..60362dd94a
--- /dev/null
+++ b/files/zh-cn/web/api/xmlhttprequest/loadstart_event/index.html
@@ -0,0 +1,91 @@
+---
+title: loadstart
+slug: Web/Events/loadstart
+tags:
+  - 事件
+translation_of: Web/API/XMLHttpRequest/loadstart_event
+---
+<p>当程序开始加载时，loadstart 事件将被触发。这个事件可以被 {{domxref("XMLHttpRequest")}} 调用, 也适用于 {{htmlelement("img")}} 和 {{htmlelement("video")}} 元素.</p>
+
+<h2 id="基本信息">基本信息</h2>
+
+<dl>
+ <dt style="float: left; text-align: right; width: 120px;">规范文档</dt>
+ <dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.w3.org/TR/progress-events/">Progress</a></dd>
+ <dt style="float: left; text-align: right; width: 120px;">接口</dt>
+ <dd style="margin: 0 0 0 120px;">ProgressEvent</dd>
+ <dt style="float: left; text-align: right; width: 120px;">冒泡</dt>
+ <dd style="margin: 0 0 0 120px;">No</dd>
+ <dt style="float: left; text-align: right; width: 120px;">可取消</dt>
+ <dd style="margin: 0 0 0 120px;">No</dd>
+ <dt style="float: left; text-align: right; width: 120px;">目标</dt>
+ <dd style="margin: 0 0 0 120px;">Element</dd>
+ <dt style="float: left; text-align: right; width: 120px;">默认动作</dt>
+ <dd style="margin: 0 0 0 120px;">None</dd>
+</dl>
+
+<h2 id="属性">属性</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Property</th>
+   <th scope="col">Type</th>
+   <th scope="col">Description</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>target</code> {{readonlyInline}}</td>
+   <td>{{domxref("EventTarget")}}</td>
+   <td>The event target (the topmost target in the DOM tree).</td>
+  </tr>
+  <tr>
+   <td><code>type</code> {{readonlyInline}}</td>
+   <td>{{domxref("DOMString")}}</td>
+   <td>The type of event.</td>
+  </tr>
+  <tr>
+   <td><code>bubbles</code> {{readonlyInline}}</td>
+   <td>{{jsxref("Boolean")}}</td>
+   <td>Whether the event normally bubbles or not.</td>
+  </tr>
+  <tr>
+   <td><code>cancelable</code> {{readonlyInline}}</td>
+   <td>{{jsxref("Boolean")}}</td>
+   <td>Whether the event is cancellable or not.</td>
+  </tr>
+  <tr>
+   <td><code>lengthComputable </code>{{readonlyInline}}</td>
+   <td>{{jsxref("Boolean")}}</td>
+   <td>Specifies whether or not the total size of the transfer is known. Read only.</td>
+  </tr>
+  <tr>
+   <td><code>loaded</code> {{readonlyInline}}</td>
+   <td>unsigned long (long)</td>
+   <td>The number of bytes transferred since the beginning of the operation. This doesn't include headers and other overhead, but only the content itself. Read only.</td>
+  </tr>
+  <tr>
+   <td><code>total</code> {{readonlyInline}}</td>
+   <td>unsigned long (long)</td>
+   <td>The total number of bytes of content that will be transferred during the operation. If the total size is unknown, this value is zero. Read only.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="相关事件">相关事件</h2>
+
+<ul>
+ <li>{{event("loadstart")}}</li>
+ <li>{{event("progress")}}</li>
+ <li>{{event("error")}}</li>
+ <li>{{event("abort")}}</li>
+ <li>{{event("load")}}</li>
+ <li>{{event("loadend")}}</li>
+</ul>
+
+<h2 id="了解更多">了解更多</h2>
+
+<ul>
+ <li><a href="/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest#Monitoring_progress" title="/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest">Monitoring progress</a></li>
+</ul>
diff --git a/files/zh-cn/web/api/xmlhttprequest/progress_event/index.html b/files/zh-cn/web/api/xmlhttprequest/progress_event/index.html
new file mode 100644
index 0000000000..6a63ab9d5e
--- /dev/null
+++ b/files/zh-cn/web/api/xmlhttprequest/progress_event/index.html
@@ -0,0 +1,146 @@
+---
+title: progress event
+slug: Web/Events/进度条
+tags:
+  - API
+  - Event
+  - Reference
+  - Web
+  - XMLHttpRequest
+  - progress
+translation_of: Web/API/XMLHttpRequest/progress_event
+---
+<p>{{APIRef}}</p>
+
+<p><strong><code>progress</code></strong>事件会在请求接收到数据的时候被周期性触发。</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">Bubbles</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">Cancelable</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">Interface</th>
+   <td>{{domxref("ProgressEvent")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">Event handler property</th>
+   <td>{{domxref("XMLHttpRequestEventTarget/onprogress", "onprogress")}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="Live_example">Live example</h3>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;div class="controls"&gt;
+    &lt;input class="xhr success" type="button" name="xhr" value="Click to start XHR (success)" /&gt;
+    &lt;input class="xhr error" type="button" name="xhr" value="Click to start XHR (error)" /&gt;
+    &lt;input class="xhr abort" type="button" name="xhr" value="Click to start XHR (abort)" /&gt;
+&lt;/div&gt;
+
+&lt;textarea readonly class="event-log"&gt;&lt;/textarea&gt;</pre>
+
+<div class="hidden">
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush: css">.event-log {
+    width: 25rem;
+    height: 4rem;
+    border: 1px solid black;
+    margin: .5rem;
+    padding: .2rem;
+}
+
+input {
+    width: 11rem;
+    margin: .5rem;
+}
+</pre>
+</div>
+
+<h4 id="JS">JS</h4>
+
+<pre class="brush: js">const xhrButtonSuccess = document.querySelector('.xhr.success');
+const xhrButtonError = document.querySelector('.xhr.error');
+const xhrButtonAbort = document.querySelector('.xhr.abort');
+const log = document.querySelector('.event-log');
+
+function handleEvent(e) {
+    log.textContent = log.textContent + `${e.type}: ${e.loaded} bytes transferred\n`;
+}
+
+function addListeners(xhr) {
+    xhr.addEventListener('loadstart', handleEvent);
+    xhr.addEventListener('load', handleEvent);
+    xhr.addEventListener('loadend', handleEvent);
+    xhr.addEventListener('progress', handleEvent);
+    xhr.addEventListener('error', handleEvent);
+    xhr.addEventListener('abort', handleEvent);
+}
+
+function runXHR(url) {
+    log.textContent = '';
+
+    const xhr = new XMLHttpRequest();
+    addListeners(xhr);
+    xhr.open("GET", url);
+    xhr.send();
+    return xhr;
+}
+
+xhrButtonSuccess.addEventListener('click', () =&gt; {
+    runXHR('https://mdn.mozillademos.org/files/16553/DgsZYJNXcAIPwzy.jpg');
+});
+
+xhrButtonError.addEventListener('click', () =&gt; {
+    runXHR('https://somewhere.org/i-dont-exist');
+});
+
+xhrButtonAbort.addEventListener('click', () =&gt; {
+    runXHR('https://mdn.mozillademos.org/files/16553/DgsZYJNXcAIPwzy.jpg').abort();
+});</pre>
+
+<h4 id="Result">Result</h4>
+
+<p>{{ EmbedLiveSample('Live_example', '100%', '150px') }}</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('XMLHttpRequest', '#event-xhr-progress')}}</td>
+   <td>{{Spec2('XMLHttpRequest')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.XMLHttpRequest.progress_event")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>Related events: {{domxref("XMLHttpRequest/loadstart_event", "loadstart")}}, {{domxref("XMLHttpRequest/load_event", "load")}}, {{domxref("XMLHttpRequest/loadend_event", "loadend")}}, {{domxref("XMLHttpRequest/error_event", "error")}}, {{domxref("XMLHttpRequest/abort_event", "abort")}}</li>
+ <li><a href="/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest#Monitoring_progress">Monitoring progress</a></li>
+</ul>