[improvement] adjust utils

packages/utils/index.ts

@@ -1,7 +1,7 @@
 import Vue from 'vue';
-import { isNumber } from './validate/number';
 
 export { use } from './use';
+export { suffixPx } from './format/unit';
 
 export const isServer: boolean = Vue.prototype.$isServer;
 
@@ -26,39 +26,3 @@ export function get(object: any, path: string): any {
 
   return result;
 }
-
-const camelizeRE = /-(\w)/g;
-export function camelize(str: string): string {
-  return str.replace(camelizeRE, (_, c) => c.toUpperCase());
-}
-
-export function isAndroid(): boolean {
-  /* istanbul ignore next */
-  return isServer ? false : /android/.test(navigator.userAgent.toLowerCase());
-}
-
-export function isIOS(): boolean {
-  /* istanbul ignore next */
-  return isServer ? false : /ios|iphone|ipad|ipod/.test(navigator.userAgent.toLowerCase());
-}
-
-export function range(num: number, min: number, max: number): number {
-  return Math.min(Math.max(num, min), max);
-}
-
-export function isInDocument(element: HTMLElement): boolean {
-  return document.body.contains(element);
-}
-
-export function suffixPx(value?: string | number): string | undefined {
-  if (!isDef(value)) {
-    return undefined;
-  }
-
-  value = String(value);
-  return isNumber(value) ? `${value}px` : value;
-}
-
-export function padZero(num: number | string): string {
-  return (num < 10 ? '0' : '') + num;
-}