1、修复几处bug；

2、完善内容管理中的细节功能

app/model/Category.php

@@ -21,6 +21,10 @@ class Category extends \think\Model{
 		'icon' => 'integer',
 	);
 
+	protected static function onAfterUpdate($model){
+		$data = $model->toArray();
+	}
+
 	public static function getCategoryTree($map = []){
 		$list = self::where($map)->select();
 
@@ -31,22 +35,6 @@ class Category extends \think\Model{
 		return $list;
 	}
 
-	public function change() {
-		$data = input('post.');
-		if ($data['id']) {
-			$result = $this->save($data, array('id' => $data['id']));
-		} else {
-			unset($data['id']);
-			$result = $this->save($data);
-		}
-		if (false !== $result) {
-			return true;
-		} else {
-			$this->error = "失败！";
-			return false;
-		}
-	}
-
 	public function info($id, $field = true) {
 		return $this->db()->where(array('id' => $id))->field($field)->find();
 	}