Three.js How to modify a material shader multiple times

Questions
1

I have a mesh with MeshNormalMaterial.
Now I want to change the shader of this material according to my needs. I thought of using onBeforeCompile to modify this shader, but I have already used onBeforeCompile to complete other functions.
My expected result is to change the shader based on the shader modified by onbeforeCompile.
Is there any way to do this

2

You may find this thread on chainable-onBeforeCompile uniforms useful

3

Thank you so much,this seems to slove my problem.

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