<script> class P2{ constructor(x=0,y=0){this.x=x;this.y=y} get clone(){return new P2(this.x,this.y)}//複写 add({x=0,y=0},{x:X,y:Y}=this){this.x=X+x;this.y=Y+y;return this}//加算 sub({x=0,y=0},{x:X,y:Y}=this){this.x=X-x;this.y=Y-y;return this}//減算…