RenderingContext
is a WebIDL
typedef
which can refer to any one of the interfaces that represent a graphics rendering context within a
<canvas>
元素：
CanvasRenderingContext2D
,
WebGLRenderingContext
，或
WebGL2RenderingContext
.
By using the shorthand
RenderingContext
, methods and properties which can make use of any of these interfaces can be specified and written more easily; since
<canvas>
supports several rendering systems, it's helpful from a specification and browser implementation perspective to have a shorthand that means "one of these interfaces."
As such,
RenderingContext
is an implementation detail, and isn't something web developers directly use. There is no
RenderingContext
interface, and there are no objects which implement type
RenderingContext
.
The primary use of this type is the definition of the
<canvas>
元素的
HTMLCanvasElement.getContext()
method, which returns a
RenderingContext
(meaning it returns any one of the rendering context types).
| 规范 | 状态 | 注释 |
|---|---|---|
|
HTML 实时标准
The definition of 'RenderingContext' in that specification. |
实时标准 | 初始定义。 |
CanvasRenderingContext2D
,
WebGLRenderingContext
，和
WebGL2RenderingContext
<canvas>