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+---
+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>