---
title: WebGLRenderingContext.getParameter()
slug: Web/API/WebGLRenderingContext/getParameter
tags:
  - WebGL
translation_of: Web/API/WebGLRenderingContext/getParameter
---
<div>{{APIRef("WebGL")}}</div>

<p><a href="/en-US/docs/Web/API/WebGL_API">WebGL API</a> 的 <strong><code>WebGLRenderingContext.getParameter()</code></strong> 方法为传入的参数名称返回一个值。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox">any <var>gl</var>.getParameter(<var>pname</var>);
</pre>

<h3 id="参数">参数</h3>

<dl>
 <dt><code>pname</code></dt>
 <dd>一个指定要返回哪个参数值的 {{domxref("GLenum")}}。请参阅下文的可能值。</dd>
</dl>

<h3 id="返回值">返回值</h3>

<p>取决于参数。</p>

<h2 id="参数名称">参数名称</h2>

<h3 id="WebGL_1">WebGL 1</h3>

<p>使用 {{domxref("WebGLRenderingContext")}} 时，您可以查询以下 <code>pname</code> 参数。</p>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">常量</th>
   <th scope="col">返回类型</th>
   <th scope="col">描述</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><code>gl.ACTIVE_TEXTURE</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.ALIASED_LINE_WIDTH_RANGE</code></td>
   <td>{{jsxref("Float32Array")}} (with 2 elements)</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.ALIASED_POINT_SIZE_RANGE</code></td>
   <td>{{jsxref("Float32Array")}} (with 2 elements)</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.ALPHA_BITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.ARRAY_BUFFER_BINDING</code></td>
   <td>{{domxref("WebGLBuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLEND</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLEND_COLOR</code></td>
   <td>{{jsxref("Float32Array")}} (with 4 values)</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLEND_DST_ALPHA</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLEND_DST_RGB</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLEND_EQUATION</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLEND_EQUATION_ALPHA</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLEND_EQUATION_RGB</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLEND_SRC_ALPHA</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLEND_SRC_RGB</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.BLUE_BITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.COLOR_CLEAR_VALUE</code></td>
   <td>{{jsxref("Float32Array")}} (with 4 values)</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.COLOR_WRITEMASK</code></td>
   <td>sequence&lt;{{domxref("GLboolean")}}&gt; (with 4 values)</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.COMPRESSED_TEXTURE_FORMATS</code></td>
   <td>{{jsxref("Uint32Array")}}</td>
   <td>返回压缩的纹理格式。<br>
    <br>
    当使用 {{domxref("WEBGL_compressed_texture_s3tc")}} 扩展时：
    <ul>
     <li><code>ext.COMPRESSED_RGB_S3TC_DXT1_EXT</code></li>
     <li><code>ext.COMPRESSED_RGBA_S3TC_DXT1_EXT</code></li>
     <li><code>ext.COMPRESSED_RGBA_S3TC_DXT3_EXT</code></li>
     <li><code>ext.COMPRESSED_RGBA_S3TC_DXT5_EXT</code></li>
    </ul>

    <p>当使用 {{domxref("WEBGL_compressed_texture_s3tc_srgb")}} 扩展时：</p>

    <ul>
     <li><code>ext.COMPRESSED_SRGB_S3TC_DXT1_EXT</code></li>
     <li><code>ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT</code></li>
     <li><code>ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT</code></li>
     <li><code>ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT</code></li>
    </ul>
    当使用 {{domxref("WEBGL_compressed_texture_es3")}} 扩展时：

    <ul>
     <li><code>ext.COMPRESSED_R11_EAC</code></li>
     <li><code>ext.COMPRESSED_SIGNED_R11_EAC</code></li>
     <li><code>ext.COMPRESSED_RG11_EAC</code></li>
     <li><code>ext.COMPRESSED_SIGNED_RG11_EAC</code></li>
     <li><code>ext.COMPRESSED_RGB8_ETC2</code></li>
     <li><code>ext.COMPRESSED_RGBA8_ETC2_EAC</code></li>
     <li><code>ext.COMPRESSED_SRGB8_ETC2</code></li>
     <li><code>ext.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC</code></li>
     <li><code>ext.COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2</code></li>
     <li><code>ext.COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2</code></li>
    </ul>
    当使用 {{domxref("WEBGL_compressed_texture_pvrtc")}} 扩展时：

    <ul>
     <li><code>ext.COMPRESSED_RGB_PVRTC_4BPPV1_IMG</code></li>
     <li><code>ext.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG</code></li>
     <li><code>ext.COMPRESSED_RGB_PVRTC_2BPPV1_IMG</code></li>
     <li><code>ext.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG</code></li>
    </ul>
    当使用 {{domxref("WEBGL_compressed_texture_etc1")}} 扩展时：

    <ul>
     <li><code>ext.COMPRESSED_RGB_ETC1_WEBGL</code></li>
    </ul>
    当使用 {{domxref("WEBGL_compressed_texture_atc")}} 扩展时：

    <ul>
     <li><code>ext.COMPRESSED_RGB_ATC_WEBGL</code></li>
     <li><code>ext.COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL</code></li>
     <li><code>ext.COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_WEBGL</code></li>
    </ul>
    当使用 {{domxref("WEBGL_compressed_texture_astc")}} 扩展时：

    <ul>
     <li><code>ext.COMPRESSED_RGBA_ASTC_4x4_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_5x4_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_5x5_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_6x5_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_6x6_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_8x5_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_8x6_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_8x8_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_10x5_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_10x6_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_10x6_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_10x10_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_12x10_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR</code></li>
     <li><code>ext.COMPRESSED_RGBA_ASTC_12x12_KHR<br>
      ext.COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR</code></li>
    </ul>
   </td>
  </tr>
  <tr>
   <td><code>gl.CULL_FACE</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.CULL_FACE_MODE</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.CURRENT_PROGRAM</code></td>
   <td>{{domxref("WebGLProgram")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.DEPTH_BITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.DEPTH_CLEAR_VALUE</code></td>
   <td>{{domxref("GLfloat")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.DEPTH_FUNC</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.DEPTH_RANGE</code></td>
   <td>{{jsxref("Float32Array")}} (with 2 elements)</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.DEPTH_TEST</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.DEPTH_WRITEMASK</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.DITHER</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.ELEMENT_ARRAY_BUFFER_BINDING</code></td>
   <td>{{domxref("WebGLBuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.FRAMEBUFFER_BINDING</code></td>
   <td>{{domxref("WebGLFramebuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.FRONT_FACE</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.GENERATE_MIPMAP_HINT</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.GREEN_BITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.IMPLEMENTATION_COLOR_READ_FORMAT</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.IMPLEMENTATION_COLOR_READ_TYPE</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.LINE_WIDTH</code></td>
   <td>{{domxref("GLfloat")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_CUBE_MAP_TEXTURE_SIZE</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_FRAGMENT_UNIFORM_VECTORS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_RENDERBUFFER_SIZE</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_TEXTURE_IMAGE_UNITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_TEXTURE_SIZE</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_VARYING_VECTORS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_VERTEX_ATTRIBS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_VERTEX_TEXTURE_IMAGE_UNITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_VERTEX_UNIFORM_VECTORS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_VIEWPORT_DIMS</code></td>
   <td>{{jsxref("Int32Array")}} (with 2 elements)</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.PACK_ALIGNMENT</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.POLYGON_OFFSET_FACTOR</code></td>
   <td>{{domxref("GLfloat")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.POLYGON_OFFSET_FILL</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.POLYGON_OFFSET_UNITS</code></td>
   <td>{{domxref("GLfloat")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.RED_BITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.RENDERBUFFER_BINDING</code></td>
   <td>{{domxref("WebGLRenderbuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.RENDERER</code></td>
   <td>{{domxref("DOMString")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SAMPLE_BUFFERS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SAMPLE_COVERAGE_INVERT</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SAMPLE_COVERAGE_VALUE</code></td>
   <td>{{domxref("GLfloat")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SAMPLES</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SCISSOR_BOX</code></td>
   <td>{{jsxref("Int32Array")}} (with 4 elements)</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SCISSOR_TEST</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SHADING_LANGUAGE_VERSION</code></td>
   <td>{{domxref("DOMString")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_BACK_FAIL</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_BACK_FUNC</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_BACK_PASS_DEPTH_FAIL</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_BACK_PASS_DEPTH_PASS</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_BACK_REF</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_BACK_VALUE_MASK</code></td>
   <td>{{domxref("GLuint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_BACK_WRITEMASK</code></td>
   <td>{{domxref("GLuint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_BITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_CLEAR_VALUE</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_FAIL</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_FUNC</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_PASS_DEPTH_FAIL</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_PASS_DEPTH_PASS</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_REF</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_TEST</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_VALUE_MASK</code></td>
   <td>{{domxref("GLuint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.STENCIL_WRITEMASK</code></td>
   <td>{{domxref("GLuint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SUBPIXEL_BITS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.TEXTURE_BINDING_2D</code></td>
   <td>{{domxref("WebGLTexture")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.TEXTURE_BINDING_CUBE_MAP</code></td>
   <td>{{domxref("WebGLTexture")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNPACK_ALIGNMENT</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNPACK_COLORSPACE_CONVERSION_WEBGL</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNPACK_FLIP_Y_WEBGL</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.VENDOR</code></td>
   <td>{{domxref("DOMString")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.VERSION</code></td>
   <td>{{domxref("DOMString")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.VIEWPORT</code></td>
   <td>{{jsxref("Int32Array")}} (with 4 elements)</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h3 id="WebGL_2">WebGL 2</h3>

<p>使用 {{domxref("WebGL2RenderingContext")}} 时，您可以查询以下 <code>pname</code> 参数。</p>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">常量</th>
   <th scope="col">返回类型</th>
   <th scope="col">描述</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><code>gl.COPY_READ_BUFFER_BINDING</code></td>
   <td>{{domxref("WebGLBuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.COPY_WRITE_BUFFER_BINDING</code></td>
   <td>{{domxref("WebGLBuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.DRAW_BUFFER<em>i</em></code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.DRAW_FRAMEBUFFER_BINDING</code></td>
   <td>{{domxref("WebGLFramebuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.FRAGMENT_SHADER_DERIVATIVE_HINT</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_3D_TEXTURE_SIZE</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_ARRAY_TEXTURE_LAYERS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_CLIENT_WAIT_TIMEOUT_WEBGL</code></td>
   <td>{{domxref("GLint64")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_COLOR_ATTACHMENTS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS</code></td>
   <td>{{domxref("GLint64")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_COMBINED_UNIFORM_BLOCKS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS</code></td>
   <td>{{domxref("GLint64")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_DRAW_BUFFERS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_ELEMENT_INDEX</code></td>
   <td>{{domxref("GLint64")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_ELEMENTS_INDICES</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_ELEMENTS_VERTICES</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_FRAGMENT_INPUT_COMPONENTS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_FRAGMENT_UNIFORM_BLOCKS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_FRAGMENT_UNIFORM_COMPONENTS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_PROGRAM_TEXEL_OFFSET</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_SAMPLES</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_SERVER_WAIT_TIMEOUT</code></td>
   <td>{{domxref("GLint64")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_TEXTURE_LOD_BIAS</code></td>
   <td>{{domxref("GLfloat")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_UNIFORM_BLOCK_SIZE</code></td>
   <td>{{domxref("GLint64")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_UNIFORM_BUFFER_BINDINGS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_VARYING_COMPONENTS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_VERTEX_OUTPUT_COMPONENTS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_VERTEX_UNIFORM_BLOCKS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MAX_VERTEX_UNIFORM_COMPONENTS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.MIN_PROGRAM_TEXEL_OFFSET</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.PACK_ROW_LENGTH</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.PACK_SKIP_PIXELS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.PACK_SKIP_ROWS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.PIXEL_PACK_BUFFER_BINDING</code></td>
   <td>{{domxref("WebGLBuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.PIXEL_UNPACK_BUFFER_BINDING</code></td>
   <td>{{domxref("WebGLBuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.RASTERIZER_DISCARD</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.READ_BUFFER</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.READ_FRAMEBUFFER_BINDING</code></td>
   <td>{{domxref("WebGLFramebuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SAMPLE_ALPHA_TO_COVERAGE</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SAMPLE_COVERAGE</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.SAMPLER_BINDING</code></td>
   <td>{{domxref("WebGLSampler")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.TEXTURE_BINDING_2D_ARRAY</code></td>
   <td>{{domxref("WebGLTexture")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.TEXTURE_BINDING_3D</code></td>
   <td>{{domxref("WebGLTexture")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.TRANSFORM_FEEDBACK_ACTIVE</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.TRANSFORM_FEEDBACK_BINDING</code></td>
   <td>{{domxref("WebGLTransformFeedback")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.TRANSFORM_FEEDBACK_BUFFER_BINDING</code></td>
   <td>{{domxref("WebGLBuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.TRANSFORM_FEEDBACK_PAUSED</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNIFORM_BUFFER_BINDING</code></td>
   <td>{{domxref("WebGLBuffer")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNIFORM_BUFFER_OFFSET_ALIGNMENT</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNPACK_IMAGE_HEIGHT</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNPACK_ROW_LENGTH</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNPACK_SKIP_IMAGES</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNPACK_SKIP_PIXELS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.UNPACK_SKIP_ROWS</code></td>
   <td>{{domxref("GLint")}}</td>
   <td> </td>
  </tr>
  <tr>
   <td><code>gl.VERTEX_ARRAY_BINDING</code></td>
   <td>{{domxref("WebGLVertexArrayObject")}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h3 id="WebGL_扩展">WebGL 扩展</h3>

<p>当使用 <a href="/en-US/docs/Web/API/WebGL_API/Using_Extensions">WebGL 扩展</a> 时，您可以查询以下 <code>pname</code> 参数：</p>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">常量</th>
   <th scope="col">返回类型</th>
   <th scope="col">扩展</th>
   <th scope="col">描述</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><code>ext.MAX_TEXTURE_MAX_ANISOTROPY_EXT</code></td>
   <td>{{domxref("GLfloat")}}</td>
   <td>{{domxref("EXT_texture_filter_anisotropic")}}</td>
   <td>最大可用各向异性。</td>
  </tr>
  <tr>
   <td><code>ext.FRAGMENT_SHADER_DERIVATIVE_HINT_OES</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td>{{domxref("OES_standard_derivatives")}}</td>
   <td>GLSL 内置函数的导数计算精度：<code>dFdx</code>、 <code>dFdy</code> 和 <code>fwidth</code>。</td>
  </tr>
  <tr>
   <td><code>ext.MAX_COLOR_ATTACHMENTS_WEBGL</code></td>
   <td>{{domxref("GLint")}}</td>
   <td>{{domxref("WEBGL_draw_buffers")}}</td>
   <td>帧缓冲区颜色附着点的最大数量。</td>
  </tr>
  <tr>
   <td><code>ext.MAX_DRAW_BUFFERS_WEBGL</code></td>
   <td>{{domxref("GLint")}}</td>
   <td>{{domxref("WEBGL_draw_buffers")}}</td>
   <td>绘图缓冲区的最大数量。</td>
  </tr>
  <tr>
   <td><code>ext.DRAW_BUFFER0_WEBGL<br>
    ext.DRAW_BUFFER1_WEBGL<br>
    ext.DRAW_BUFFER2_WEBGL<br>
    ext.DRAW_BUFFER3_WEBGL<br>
    ext.DRAW_BUFFER4_WEBGL<br>
    ext.DRAW_BUFFER5_WEBGL<br>
    ext.DRAW_BUFFER6_WEBGL<br>
    ext.DRAW_BUFFER7_WEBGL<br>
    ext.DRAW_BUFFER8_WEBGL<br>
    ext.DRAW_BUFFER9_WEBGL<br>
    ext.DRAW_BUFFER10_WEBGL<br>
    ext.DRAW_BUFFER11_WEBGL<br>
    ext.DRAW_BUFFER12_WEBGL<br>
    ext.DRAW_BUFFER13_WEBGL<br>
    ext.DRAW_BUFFER14_WEBGL<br>
    ext.DRAW_BUFFER15_WEBGL</code></td>
   <td>{{domxref("GLenum")}}</td>
   <td>{{domxref("WEBGL_draw_buffers")}}</td>
   <td>绘图缓冲区。</td>
  </tr>
  <tr>
   <td><code>ext.VERTEX_ARRAY_BINDING_OES</code></td>
   <td>{{domxref("WebGLVertexArrayObjectOES")}}</td>
   <td>{{domxref("OES_vertex_array_object")}}</td>
   <td>绑定的顶点数组对象（VAO）。</td>
  </tr>
  <tr>
   <td><code>ext.TIMESTAMP_EXT</code></td>
   <td>{{domxref("GLuint64EXT")}}</td>
   <td>
    <p>{{domxref("EXT_disjoint_timer_query")}}</p>
   </td>
   <td>当前时间。</td>
  </tr>
  <tr>
   <td><code>ext.GPU_DISJOINT_EXT</code></td>
   <td>{{domxref("GLboolean")}}</td>
   <td>{{domxref("EXT_disjoint_timer_query")}}</td>
   <td>
    <p>返回 GPU 是否执行了任何不相交的操作。</p>
   </td>
  </tr>
 </tbody>
</table>

<h2 id="示例">示例</h2>

<pre class="brush: js">gl.getParameter(gl.DITHER);
gl.getParameter(gl.VERSION);
gl.getParameter(gl.VIEWPORT);
</pre>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">规范</th>
   <th scope="col">状态</th>
   <th scope="col">注释</th>
  </tr>
  <tr>
   <td>{{SpecName('WebGL', "#5.14.3", "getParameter")}}</td>
   <td>{{Spec2('WebGL')}}</td>
   <td>初始定义。</td>
  </tr>
  <tr>
   <td>{{SpecName('WebGL2', "#3.7.2", "getParameter")}}</td>
   <td>{{Spec2('WebGL2')}}</td>
   <td>添加额外的参数名称。</td>
  </tr>
  <tr>
   <td>{{SpecName('OpenGL ES 2.0', "glGet.xml", "glGet")}}</td>
   <td>{{Spec2('OpenGL ES 2.0')}}</td>
   <td>（类似的）OpenGL API的手册页。</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

<p>{{Compat("api.WebGLRenderingContext.getParameter")}}</p>

<h2 id="另请参阅">另请参阅</h2>

<ul>
 <li>{{domxref("WebGLRenderingContext.enable()")}}</li>
 <li>{{domxref("WebGLRenderingContext.disable()")}}</li>
 <li>{{domxref("EXT_texture_filter_anisotropic")}}</li>
 <li>{{domxref("OES_standard_derivatives")}}</li>
 <li>{{domxref("WEBGL_draw_buffers")}}</li>
 <li>{{domxref("EXT_disjoint_timer_query")}}</li>
</ul>