feat(Picker): item-height support rem unit (#6462)

src/utils/format/unit.ts

@@ -9,3 +9,24 @@ export function addUnit(value?: string | number): string | undefined {
   value = String(value);
   return isNumeric(value) ? `${value}px` : value;
 }
+
+function convertRem(value: string) {
+  const rootStyle = window.getComputedStyle(document.documentElement);
+  const rootFontSize = parseFloat(rootStyle.fontSize);
+
+  value = value.replace(/rem/g, '');
+
+  return +value * rootFontSize;
+}
+
+export function unitToPx(value: string | number): number {
+  if (typeof value === 'number') {
+    return value;
+  }
+
+  if (value.indexOf('rem') !== -1) {
+    return convertRem(value);
+  }
+
+  return parseFloat(value);
+}