删除数据
// 根据主键删除
Db::table('think_user')->delete(1);
Db::table('think_user')->delete([1,2,3]);

// 条件删除
Db::table('think_user')->where('id',1)->delete();
Db::table('think_user')->where('id','<',10)->delete();

最终生成的SQL语句可能是：

DELETE FROM think_user WHERE id = 1
DELETE FROM think_user WHERE id IN (1,2,3)
DELETE FROM think_user WHERE id = 1
DELETE FROM think_user WHERE id < 10

通过上面可以看出，无论TP的删除语法是什么样的，都是 通过PHP原生语句转化来的；