var nn="";

module.exports = async (ctx, next) => {

 var data = ctx.request.query.ID;

 var sql = 'SELECT * FROM facility WHERE id='+data;

 connection.query(sql, function (err, result) {

   if (err) {

     console.log('[SELECT ERROR] - ', err.message);

   }

nn = result[0];

   // ctx.response.body = nn;

   console.log('--------------------------SELECT----------------------------');

   console.log(result);

   console.log('------------------------------------------------------------\n\n');

 });

ctx.body = nn;

}

要编译两次才能显示结果，看到好像因为异步的关系但不会改