javascript - How to clear the last drawn circle in canvas

Question

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我想大声告诉你 · Answer

I solved it myself

Put the cleared one in front of the drawing and execute it in one step

欧阳克 · Answer

clearRect() There should be this API in the documentation

巴扎黑 · Answer

Don’t continue painting. Will the clear effect be achieved soon? This is how I completed the clearing before