thinkphp 多表查询jion 两种方法

第一种：
$data = M('user  as  a')->join('jifen  as  b  on b.id = a.id')->where('a.id  =  1')->select();

第二种：
$data = M()->table('user  as  a')->join('jifen  as  b  on  b.id = a.id')->where(' a.id = 1 ')->select();