修改sketch切换下一张进行询问

src/tool/canvasGeneral.js

@@ -136,6 +136,8 @@ class myCanvas {
 		let oldCanvasDom1 =  this.canvasDomParent.querySelector('canvas')
 		if(oldCanvasDom)oldCanvasDom.remove()
 		if(oldCanvasDom1)oldCanvasDom1.remove()
+		this.reverseCanvasState=[];//撤回
+		this.normalCanvasState=[];//反撤回
 		document.removeEventListener("keydown", this.canvasKeyDown);
 		document.removeEventListener("keyup", this.canvasKeyUp);