小程序开发过程中发现一个我问题，我通过云平台在线测试代码是可以调用成功的，但是用云函数调用平台的测试代码就没有任何返回，也没有报错，请问是怎么回事？下面是云函数代码：

const cloud = require('wx-server-sdk');

cloud.init();

const tencentcloud = require("tencentcloud-sdk-nodejs")

// 云函数入口函数

exports.main = async (event, context) => {

const TiiaClient = tencentcloud.tiia.v20190529.Client;

const models = tencentcloud.tiia.v20190529.Models;

const Credential = tencentcloud.common.Credential;

const ClientProfile = tencentcloud.common.ClientProfile;

const HttpProfile = tencentcloud.common.HttpProfile;

let cred = new Credential("AKIDzlJdkcMHFwNchWlVeXAZmmX3LSJvAgmd", "mKdgdKm0ziBwTlpcASUGqCJAl7F8lpvl");

let httpProfile = new HttpProfile();

httpProfile.endpoint = "tiia.tencentcloudapi.com";

let clientProfile = new ClientProfile();

clientProfile.httpProfile = httpProfile;

let client = new TiiaClient(cred, "ap-guangzhou", clientProfile);

let req = new models.ImageModerationRequest();

let params = '{"Scenes":["PORN"],"ImageUrl":"https://636c-cloudde-5c0a91-1300515261.tcb.qcloud.la/test.png"}'

req.from_json_string(params);

client.ImageModeration(req, function (errMsg, response) {

if (errMsg) {

console.log(errMsg);

return;

}

console.log(response.to_json_string());

});

}