| passIndex | 通道的索引。 |
| tagName | The name of the tag. |
Searches for the tag specified by tagName on the shader's active SubShader and returns the value of the tag.
| subshaderIndex | The index of the SubShader. |
| passIndex | 通道的索引。 |
| tagName | The name of the tag. |
Searches for the tag specified by tagName on the SubShader specified by subshaderIndex and returns the value of the tag.