message: [Improvement] IndexBar: Use transform to optimize
diff: @@ -25,7 +25,7 @@ export default sfc({
  anchorStyle() {
  if (this.sticky) {
  return {
  - top: `${this.top}px`,
  + transform: `translate3d(0, ${this.top}px, 0)`,
  color: this.parent.highlightColor,
  zIndex: `${this.parent.zIndex}`
  };
  