fix:Add es6-map implement in case old browser doesnot support Map

build/configs.js

@@ -83,6 +83,7 @@ function genConfig (opts) {
       'lodash/isFinite',
       'lodash/debounce',
       'lodash/throttle',
+      'es6-map/implement'
     ]
   }
 

build/rollup.dev.config.js

@@ -14,5 +14,6 @@ export default {
     'lodash/isFinite',
     'lodash/debounce',
     'lodash/throttle',
+    'es6-map/implement'
   ]
 }

dist/vue-scroll.common.js

@@ -13,6 +13,7 @@ var _isInteger = _interopDefault(require('lodash/isInteger'));
 var _isFinite = _interopDefault(require('lodash/isFinite'));
 var _debounce = _interopDefault(require('lodash/debounce'));
 var _throttle = _interopDefault(require('lodash/throttle'));
+require('es6-map/implement');
 
 var dom = (function () {
   var listeners = new Map();

dist/vue-scroll.esm.js

@@ -9,6 +9,7 @@ import _isInteger from 'lodash/isInteger';
 import _isFinite from 'lodash/isFinite';
 import _debounce from 'lodash/debounce';
 import _throttle from 'lodash/throttle';
+import 'es6-map/implement';
 
 var dom = (function () {
   var listeners = new Map();