support vue 2.2 (#3097)

packages/scrollbar/src/main.js

@@ -2,7 +2,7 @@
 
 import { addResizeListener, removeResizeListener } from 'element-ui/src/utils/resize-event';
 import scrollbarWidth from 'element-ui/src/utils/scrollbar-width';
-import * as util from './util';
+import { toObject } from 'element-ui/src/utils/util';
 import Bar from './bar';
 
 /* istanbul ignore next */
@@ -48,7 +48,7 @@ export default {
       const gutterStyle = `margin-bottom: ${gutterWith}; margin-right: ${gutterWith};`;
 
       if (Array.isArray(this.wrapStyle)) {
-        style = util.toObject(this.wrapStyle);
+        style = toObject(this.wrapStyle);
         style.marginRight = style.marginBottom = gutterWith;
       } else if (typeof this.wrapStyle === 'string') {
         style += gutterStyle;

packages/scrollbar/src/util.js

-import Vue from 'vue';
-
 export const BAR_MAP = {
   vertical: {
     offset: 'offsetHeight',
@@ -34,5 +32,3 @@ export function renderThumbStyle({ move, size, bar }) {
 
   return style;
 };
-
-export const toObject = Vue.util.toObject;

src/locale/format.js

+import { hasOwn } from 'element-ui/src/utils/util';
+
+const RE_NARGS = /(%|)\{([0-9a-zA-Z_]+)\}/g;
 /**
  *  String format template
  *  - Inspired:
  *    https://github.com/Matt-Esch/string-template/index.js
  */
-
-const RE_NARGS = /(%|)\{([0-9a-zA-Z_]+)\}/g;
-
 export default function(Vue) {
-  const { hasOwn } = Vue.util;
 
   /**
    * template

src/utils/util.js

+const hasOwnProperty = Object.prototype.hasOwnProperty;
+export function hasOwn(obj, key) {
+  return hasOwnProperty.call(obj, key);
+};
+
+function extend(to, _from) {
+  for (let key in _from) {
+    to[key] = _from[key];
+  }
+  return to;
+};
+
+export function toObject(arr) {
+  var res = {};
+  for (let i = 0; i < arr.length; i++) {
+    if (arr[i]) {
+      extend(res, arr[i]);
+    }
+  }
+  return res;
+};

src/utils/vdom.js

-import Vue from 'vue';
+import { hasOwn } from 'element-ui/src/utils/util';
 
 export function isVNode(node) {
-  return typeof node === 'object' && Vue.util.hasOwn(node, 'componentOptions');
+  return typeof node === 'object' && hasOwn(node, 'componentOptions');
 };
 
 export function getFirstComponentChild(children) {