整理代码

src/base/single/0.single.js

@@ -13,6 +13,7 @@ BI.Single = BI.inherit(BI.Widget, {
     _defaultConfig: function () {
         var conf = BI.Single.superclass._defaultConfig.apply(this, arguments);
         return BI.extend(conf, {
+            el: {},
             readonly: false,
             title: null,
             warningTitle: null,
@@ -22,6 +23,10 @@ BI.Single = BI.inherit(BI.Widget, {
         });
     },
 
+    render: function () {
+        return this.options.el;
+    },
+
     _showToolTip: function (e, opt) {
         opt || (opt = {});
         var self = this, o = this.options;