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---
title: WEBGL_lose_context.restoreContext()
slug: Web/API/WEBGL_lose_context/restoreContext
tags:
- API
- Method
- Reference
- WebGL
- WebGL extension
translation_of: Web/API/WEBGL_lose_context/restoreContext
---
<div>{{APIRef("WebGL")}}</div>
<p><strong>WEBGL_lose_context.restoreContext()</strong> 属于 <a href="/en-US/docs/Web/API/WebGL_API">WebGL API</a>。 ， 一般用来模拟 {{domxref("WebGLRenderingContext")}} 的上下文恢复。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">gl.getExtension('WEBGL_lose_context').restoreContext();</pre>
<h3 id="抛出错误">抛出错误</h3>
<ul>
<li><code>INVALID_OPERATION</code> 上下文尚未丢失</li>
</ul>
<h2 id="示例">示例</h2>
<p>你可以用这个方法模拟 <code><a href="/en-US/docs/Web/API/HTMLCanvasElement/webglcontextrestored_event">webglcontextrestored</a></code> 事件：</p>
<pre class="brush: js">var canvas = document.getElementById('canvas');
var gl = canvas.getContext('webgl');
canvas.addEventListener('webglcontextrestored', function(e) {
console.log(e);
}, false);
gl.getExtension('WEBGL_lose_context').restoreContext();
</pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('WEBGL_lose_context', "", "WEBGL_lose_context.loseContext")}}</td>
<td>{{Spec2('WEBGL_lose_context')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
<p>{{Compat("api.WEBGL_lose_context.restoreContext")}}</p>
<h2 id="相关链接">相关链接</h2>
<ul>
<li>{{domxref("WebGLRenderingContext.isContextLost()")}}</li>
<li>事件： <code><a href="/en-US/docs/Web/API/HTMLCanvasElement/webglcontextlost_event">webglcontextlost</a></code>, <code><a href="/en-US/docs/Web/API/HTMLCanvasElement/webglcontextrestored_event">webglcontextrestored</a></code>, <code><a href="/en-US/docs/Web/API/HTMLCanvasElement/webglcontextcreationerror_event">webglcontextcreationerror</a></code></li>
</ul>
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