this.ctx.clearRect(obj.minLeft, obj.minTop, (obj.maxLeft - obj.minLeft), obj.height);

      this.ctx.font = absFontS + 'px bold black sans-serif';//这里是字体颜色black
      this.ctx.fillText(obj.value, this.centerTxet(obj.value, absFontS, obj.minLeft, obj.maxLeft), obj.minTop - activeTextBottom)

      this.ctx.beginPath()
      this.ctx.moveTo(obj.minLeft, obj.maxTop);
      this.ctx.lineTo(obj.minLeft, obj.minTop);
      this.ctx.lineTo(obj.maxLeft, obj.minTop);
      this.ctx.lineTo(obj.maxLeft, obj.maxTop);

      this.ctx.fillStyle = obj.active;//这里是灰色
      this.ctx.strokeStyle = obj.active;
      
      this.ctx.fill();
      this.ctx.stroke();
      
      this.ctx.restore();