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---
title: Document.readyState
slug: Web/API/Document/readyState
tags:
- API
- HTML DOM
- Reference
translation_of: Web/API/Document/readyState
---
<div>{{APIRef("DOM")}} {{ gecko_minversion_header("1.9.2") }}</div>
<h2 id="Summary" name="Summary">總覽</h2>
<p>{{ domxref("document") }} 的 <strong>Document.readyState</strong> 屬性描述文件的讀取狀態。</p>
<h3 id="數值">數值</h3>
<p>文件的 <strong>readyState</strong> 數值如下:</p>
<dl>
<dt>loading</dt>
<dd>{{ domxref("document") }} 正在讀取中。</dd>
<dt>interactive</dt>
<dd>文件已經完成讀取和解析,但是其他的子資源,如「圖片樣式層次表」,仍然在讀取。這個狀態表示 {{event("DOMContentLoaded")}} 事件已經被觸發。</dd>
<dt>complete</dt>
<dd>文件及子資源都完成讀取。這個狀態表示 {{event("load")}} 事件即將被觸發。</dd>
</dl>
<p>當這個屬性的數值改變時, {{event("readystatechange")}} 事件在 {{ domxref("document") }} 上觸發。</p>
<h2 id="表達式">表達式</h2>
<pre class="brush: js"><em>var string</em> = document.readyState;
</pre>
<h2 id="範例"><span>範例</span></h2>
<h3 id="不同的狀態">不同的狀態</h3>
<pre class="brush: js"><span>switch (document.readyState) {
case "loading":
// 文件讀取中。
break;
case "interactive":
// 文件已經完成讀取。可以使用 DOM 元素。
var span = document.createElement("span");
span.textContent = "A <span> element.";
document.body.appendChild(span);
break;
case "complete":
// 頁面已經完成讀取。
console.log("The first CSS rule is: " + document.styleSheets[0].cssRules[0].cssText);
break;
}</span>
</pre>
<h3 id="readystatechange_替代_DOMContentLoaded">readystatechange 替代 DOMContentLoaded</h3>
<pre class="brush:js">// alternative to DOMContentLoaded event
document.onreadystatechange = function () {
if (document.readyState == "interactive") {
initApplication();
}
}</pre>
<h3 id="readystatechange_替代_load">readystatechange 替代 load</h3>
<pre class="brush: js">// alternative to load event
document.onreadystatechange = function () {
if (document.readyState == "complete") {
initApplication();
}
}</pre>
<h2 id="規範">規範</h2>
<table class="spectable standard-table">
<tbody>
<tr>
<th scope="col">規範</th>
<th scope="col">狀態</th>
<th scope="col">註</th>
</tr>
<tr>
<td>{{SpecName("HTML WHATWG", "#current-document-readiness", "Document readiness")}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName("HTML5.1", "#current-document-readiness", "Document readiness")}}</td>
<td>{{Spec2('HTML5.1')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName("HTML5 W3C", "#current-document-readiness", "Document readiness")}}</td>
<td>{{Spec2('HTML5 W3C')}}</td>
<td>Initial specification.</td>
</tr>
</tbody>
</table>
<h2 id="參見">參見</h2>
<ul>
<li>{{event("readystatechange")}} event</li>
<li>{{event("DOMContentLoaded")}} event</li>
<li>{{event("load")}} event</li>
</ul>
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