下面的代码本人亲自撰写，原生不易啊。DocumentclassMyCanvas{staticdom=null;staticctx=null;staticcanvasWidth=0;staticcanvasHeight=0;staticconfig=null;staticvalx=0;staticvaly=0;staticxlist=[];staticylist=[];staticlenTrue=0;init(dom){MyCanvas.dom=domMyCanvas.ctx=MyCanvas.dom.getContext('2d');MyCanvas.canvasWidth=MyCanvas.