Add isInstance to avoid "instanceof" fail when cross scope.

src/data/Graph.js

@@ -7,6 +7,7 @@
 
 import {__DEV__} from '../config';
 import * as zrUtil from 'zrender/src/core/util';
+import {enableClassCheck} from '../util/clazz';
 
 // id may be function name of Object, add a prefix to avoid this problem.
 function generateNodeKey (id) {
@@ -138,10 +139,10 @@ graphProto.addEdge = function (n1, n2, dataIndex) {
         n2 = this.nodes[n2];
     }
 
-    if (!(n1 instanceof Node)) {
+    if (!Node.isInstance(n1)) {
         n1 = nodesMap[generateNodeKey(n1)];
     }
-    if (!(n2 instanceof Node)) {
+    if (!Node.isInstance(n2)) {
         n2 = nodesMap[generateNodeKey(n2)];
     }
     if (!n1 || !n2) {
@@ -188,10 +189,10 @@ graphProto.getEdgeByIndex = function (dataIndex) {
  * @return {module:echarts/data/Graph.Edge}
  */
 graphProto.getEdge = function (n1, n2) {
-    if (n1 instanceof Node) {
+    if (Node.isInstance(n1)) {
         n1 = n1.id;
     }
-    if (n2 instanceof Node) {
+    if (Node.isInstance(n2)) {
         n2 = n2.id;
     }
 
@@ -248,7 +249,7 @@ graphProto.eachEdge = function (cb, context) {
 graphProto.breadthFirstTraverse = function (
     cb, startNode, direction, context
 ) {
-    if (!(startNode instanceof Node)) {
+    if (!Node.isInstance(startNode)) {
         startNode = this._nodesMap[generateNodeKey(startNode)];
     }
     if (!startNode) {
@@ -516,4 +517,7 @@ zrUtil.mixin(Edge, createGraphDataProxyMixin('hostGraph', 'edgeData'));
 Graph.Node = Node;
 Graph.Edge = Edge;
 
+enableClassCheck(Node);
+enableClassCheck(Edge);
+
 export default Graph;
\ No newline at end of file

src/data/List.js

@@ -327,7 +327,7 @@ listProto.mapDimension = function (coordDim, idx) {
  */
 listProto.initData = function (data, nameList, dimValueGetter) {
 
-    var notProvider = data instanceof Source || zrUtil.isArrayLike(data);
+    var notProvider = Source.isInstance(data) || zrUtil.isArrayLike(data);
     if (notProvider) {
         data = new DefaultDataProvider(data, this.dimensions.length);
     }

src/data/Source.js

 import {createHashMap, isTypedArray} from 'zrender/src/core/util';
+import {enableClassCheck} from '../util/clazz';
 import {
     SOURCE_FORMAT_ORIGINAL,
     SERIES_LAYOUT_BY_COLUMN,
@@ -124,4 +125,6 @@ Source.seriesDataToSource = function (data) {
     });
 };
 
+enableClassCheck(Source);
+
 export default Source;
\ No newline at end of file

src/data/helper/completeDimensions.js

@@ -52,7 +52,7 @@ import {OTHER_DIMENSIONS} from './dimensionHelper';
  */
 function completeDimensions(sysDims, source, opt) {
     // ??? remove the compatible?
-    if (!(source instanceof Source)) {
+    if (!Source.isInstance(source)) {
         source = Source.seriesDataToSource(source);
     }
 

src/data/helper/dataProvider.js

@@ -19,7 +19,7 @@ import {
  * If typed array used, chunk size must be fixed.
  */
 export function DefaultDataProvider(source, dimSize) {
-    if (!(source instanceof Source)) {
+    if (!Source.isInstance(source)) {
         source = Source.seriesDataToSource(source);
     }
     this._source = source;

src/helper.js

@@ -48,7 +48,7 @@ export {createSymbol} from './util/symbol';
  */
 export function createScale(dataExtent, option) {
     var axisModel = option;
-    if (!(option instanceof Model)) {
+    if (!Model.isInstance(option)) {
         axisModel = new Model(option);
         zrUtil.mixin(axisModel, axisModelCommonMixin);
     }

src/util/clazz.js

@@ -69,6 +69,26 @@ export function enableClassExtend(RootClass, mandatoryMethods) {
     };
 }
 
+var classBase = 0;
+
+/**
+ * Can not use instanceof, consider different scope by
+ * cross domain or es module import in ec extensions.
+ * Mount a method "isInstance()" to Clz.
+ */
+export function enableClassCheck(Clz) {
+    var classAttr = ['__\0is_clz', classBase++, Math.random().toFixed(3)].join('_');
+    Clz.prototype[classAttr] = true;
+
+    if (__DEV__) {
+        zrUtil.assert(!Clz.isInstance, 'The method "is" can not be defined.');
+    }
+
+    Clz.isInstance = function (obj) {
+        return !!(obj && obj[classAttr]);
+    };
+}
+
 // superCall should have class info, which can not be fetch from 'this'.
 // Consider this case:
 // class A has method f,