getScrollBarSize.tsx 中的方法getTargetScrollBarSize在Firefox 52.9及其以前版本中报错“NS_ERROR_NOT_AVAILABLE” about util HOT 6 OPEN

const ua = navigator.userAgent;
const m = ua.match(/Firefox\/(\d+)/i);
if (m && parseInt(m[1]) <= 60) {
  const _getComputedStyle = getComputedStyle;

  const handler = {
    get: function (obj: any, prop: string) {
      try {
        return obj[prop];
      } catch (e) {
        console.log("catch getComputedStyle error", e);
        /**
         * 如果是 width 或者 height，需要返回字符串，因为 rc-util 直接对接过进行正则匹配，返回空会报错
         * https://github.com/react-component/util/blob/780a217fc67a15fc1f9170c107df001b21975f5e/src/getScrollBarSize.tsx#L57
         */
        if (prop == "width" || prop == "height") return "";
        else return undefined;
      }
    },
  };

  window.getComputedStyle = (
    elt: Element,
    pseudoElt?: string | null | undefined
  ): CSSStyleDeclaration => {
    return new Proxy(_getComputedStyle(elt, pseudoElt), handler);
  };
  console.log("Firefox 60 以下版本，替换 getComputedStyle 完成");
}