tp5.1.14报错：
1、Class think\route\dispatch\Callback contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (think\route\Dispatch::exec)

2、think\Db类中init方法：
if (!empty($config['query'])) {
self::$config['query'] = '\\think\\db\\Query';
}
是不是应该吧! 去掉？