增加beforeRender生命周期函数

src/core/widget.js

@@ -59,9 +59,11 @@
             }
         },
 
+        // 生命周期函数
         beforeInit: null,
 
-        // 生命周期函数
+        beforeRender: null,
+
         beforeCreate: null,
 
         created: null,
@@ -94,14 +96,24 @@
         },
 
         _initRender: function () {
+            var self = this;
+
+            function render () {
+                if (self.options.beforeRender || self.beforeRender) {
+                    (self.options.beforeRender || self.beforeRender).call(this, BI.bind(self._render, this));
+                } else {
+                    self._render();
+                }
+            }
+
             if (this.options.beforeInit || this.beforeInit) {
                 this.__asking = true;
-                (this.options.beforeInit || this.beforeInit).call(this, BI.bind(this._render, this));
+                (this.options.beforeInit || this.beforeInit).call(this, render);
                 if (this.__asking === true) {
                     this.__async = true;
                 }
             } else {
-                this._render();
+                render();
             }
         },