Merge branch 'master' of https://www.github.com/ecomfe/echarts

src/chart/tree/traversalHelper.js

-var traversalHelper = {
 
-    /**
-     * Traverse the tree from bottom to top and do something
-     * @param  {module:echarts/data/Tree~TreeNode} root  The real root of the tree
-     * @param  {Function} callback
-     */
-    eachAfter: function (root, callback, separation) {
-        var nodes = [root];
-        var next = [];
-        var node;
+/**
+ * Traverse the tree from bottom to top and do something
+ * @param  {module:echarts/data/Tree~TreeNode} root  The real root of the tree
+ * @param  {Function} callback
+ */
+function eachAfter (root, callback, separation) {
+    var nodes = [root];
+    var next = [];
+    var node;
 
-        while (node = nodes.pop()) { // jshint ignore:line
-            next.push(node);
-            if (node.isExpand) {
-                var children = node.children;
-                if (children.length) {
-                    for (var i = 0; i < children.length; i++) {
-                        nodes.push(children[i]);
-                    }
+    while (node = nodes.pop()) { // jshint ignore:line
+        next.push(node);
+        if (node.isExpand) {
+            var children = node.children;
+            if (children.length) {
+                for (var i = 0; i < children.length; i++) {
+                    nodes.push(children[i]);
                 }
             }
         }
+    }
 
-        while (node = next.pop()) { // jshint ignore:line
-            callback(node, separation);
-        }
-    },
+    while (node = next.pop()) { // jshint ignore:line
+        callback(node, separation);
+    }
+}
 
-    /**
-     * Traverse the tree from top to bottom and do something
-     * @param  {module:echarts/data/Tree~TreeNode} root  The real root of the tree
-     * @param  {Function} callback
-     */
-    eachBefore: function (root, callback) {
-        var nodes = [root];
-        var node;
-        while (node = nodes.pop()) { // jshint ignore:line
-            callback(node);
-            if (node.isExpand) {
-                var children = node.children;
-                if (children.length) {
-                    for (var i = children.length - 1; i >= 0; i--) {
-                        nodes.push(children[i]);
-                    }
+/**
+ * Traverse the tree from top to bottom and do something
+ * @param  {module:echarts/data/Tree~TreeNode} root  The real root of the tree
+ * @param  {Function} callback
+ */
+function eachBefore (root, callback) {
+    var nodes = [root];
+    var node;
+    while (node = nodes.pop()) { // jshint ignore:line
+        callback(node);
+        if (node.isExpand) {
+            var children = node.children;
+            if (children.length) {
+                for (var i = children.length - 1; i >= 0; i--) {
+                    nodes.push(children[i]);
                 }
             }
         }
     }
-};
+}
 
-export default traversalHelper;
\ No newline at end of file
+export { eachAfter, eachBefore };
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