chore: 优化下写法，react中children是关键字

src/base/combination/group.combo.js

@@ -16,7 +16,7 @@ BI.ComboGroup = BI.inherit(BI.Widget, {
             isNeedAdjustWidth: false,
 
             el: {type: "bi.text_button", text: "", value: ""},
-            children: [],
+            items: [],
 
             popup: {
                 el: {
@@ -36,7 +36,7 @@ BI.ComboGroup = BI.inherit(BI.Widget, {
 
     _populate: function (item) {
         var self = this, o = this.options;
-        var children = o.children;
+        var children = o.items;
         if (BI.isEmpty(children)) {
             throw new Error("ComboGroup构造错误");
         }
@@ -45,7 +45,7 @@ BI.ComboGroup = BI.inherit(BI.Widget, {
             ch = BI.formatEL(ch).el;
             if (!BI.isEmpty(son)) {
                 ch.el = BI.clone(ch);
-                ch.children = son;
+                ch.items = son;
                 ch.type = "bi.combo_group";
                 ch.action = o.action;
                 ch.height = o.height;

src/widget/downlist/popup.downlist.js

@@ -114,6 +114,7 @@ BI.DownListPopup = BI.inherit(BI.Pane, {
                         maxHeight: 378
                     };
                     item.el.childValues = [];
+                    item.items = item.children;
                     BI.each(item.children, function (i, child) {
                         var fatherValue = BI.deepClone(item.el.value);
                         var childValue = BI.deepClone(child.value);

src/widget/multilayerdownlist/popup.downlist.js

@@ -155,6 +155,7 @@ BI.MultiLayerDownListPopup = BI.inherit(BI.Pane, {
     _createChildren: function (item) {
         var self = this;
         this._formatEL(item).el.childValues = [];
+        item.items = item.children;
         BI.each(item.children, function (i, child) {
             child = child.el ? BI.extend(child.el, {children: child.children}) : child;
             var fatherValue = BI.deepClone(self._formatEL(item).el.value);