寻求帮助，koajs--前端异步请求问题？

app.post('/signup',function* (){
        var body = yield parse(this),
            name = body.username,
            email = body.email,
            password = body.password,
            password_re = body.password_re;
            this.body = {
                msg:'创建成功！',
                status:1
            };
    });

请求后xhr.status为0. this.status = 200, 也是一样的结果。或者求一个异步请求的例子，国内是否有koajs交流群？