feature: 内存溢出换一种实现方案

src/core/4.widget.js

@@ -392,7 +392,7 @@
          */
         _mount: function (force, deep, lifeHook, predicate, layer) {
             var self = this;
-            if (!force && (this._isMounted || this.__asking === true || !(this._isRoot === true || (this._parent && this._parent._isMounted === true)))) {
+            if (!force && (this._isMounted || !this.isVisible() || this.__asking === true || !(this._isRoot === true || (this._parent && this._parent._isMounted === true)))) {
                 return false;
             }
             layer = layer || 0;
@@ -748,7 +748,16 @@
             this.purgeListeners();
         },
 
+        _assetMounted: function () {
+            if (!this.isVisible()) {
+                this._setVisible(true);
+                this._mount(false, false, false);
+                this._setVisible(false);
+            }
+        },
+
         _empty: function () {
+            this._assetMounted();
             BI.each(this._children, function (i, widget) {
                 widget && widget._unMount && widget._unMount();
             });
@@ -790,6 +799,7 @@
                 });
             });
             this._watchers && (this._watchers = []);
+            this._assetMounted();
             this.__d();
             this.element.empty();
             this.element.unbind();
@@ -799,6 +809,7 @@
         },
 
         _destroy: function () {
+            this._assetMounted();
             this.__destroy();
             this.element.destroy();
             this.purgeListeners();
@@ -806,6 +817,7 @@
 
         destroy: function () {
             var self = this, o = this.options;
+            this._assetMounted();
             this.__destroy();
             if (o.animation) {
                 this._innerSetVisible(false);