WebGLRenderingContext.getError() - Web APIs 编辑

The WebGLRenderingContext.getError() method of the WebGL API returns error information.

Syntax

GLenum gl.getError();

None.

Constant	Description
`gl.NO_ERROR`	No error has been recorded. The value of this constant is 0.
`gl.INVALID_ENUM`	An unacceptable value has been specified for an enumerated argument. The command is ignored and the error flag is set.
`gl.INVALID_VALUE`	A numeric argument is out of range. The command is ignored and the error flag is set.
`gl.INVALID_OPERATION`	The specified command is not allowed for the current state. The command is ignored and the error flag is set.
`gl.INVALID_FRAMEBUFFER_OPERATION`	The currently bound framebuffer is not framebuffer complete when trying to render to or to read from it.
`gl.OUT_OF_MEMORY`	Not enough memory is left to execute the command.
`gl.CONTEXT_LOST_WEBGL`	If the WebGL context is lost, this error is returned on the first call to `getError`. Afterwards and until the context has been restored, it returns `gl.NO_ERROR`.

gl.getError(); // gl.NO_ERROR (0)

gl.enable(gl.FOOBAR);
gl.getError(); // gl.INVALID_ENUM;

Specification	Status	Comment
WebGL 1.0 The definition of 'getError' in that specification.	Recommendation	Initial definition.
OpenGL ES 2.0 The definition of 'glGetError' in that specification.	Standard	Man page of the OpenGL API.

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