function generateRandomString(length) {
  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  let result = '';
  const charactersLength = characters.length;
  for (let i = 0; i < length; i++) {
      result += characters.charAt(Math.floor(Math.random() * charactersLength));
  }
  return result;
}

const start = () => {

  setInterval(() => {

    const randomString =  generateRandomString(10);
    var myHeaders = new Headers();
    myHeaders.append("Content-Type", "application/json");
    myHeaders.append("Accept", "*/*");
    myHeaders.append("Host", "wai-server-01-qq4qmtq7wc9he4.chinahighlights.cn");
    myHeaders.append("Connection", "keep-alive");

    var raw = JSON.stringify({
       "from": "8618777396951",
       "to": "8613557032060",
       "content": randomString + "-setInterval(2min) 发送：" + new Date().toString()
    });

    var requestOptions = {
       method: 'POST',
       headers: myHeaders,
       body: raw,
       redirect: 'follow'
    };

    fetch("http://wai-server-01-qq4qmtq7wc9he4.chinahighlights.cn/api/v1/channels/send", requestOptions)
    .then(rsp => rsp.json())
    .then(json => console.info('8613557032060: ', json))
    .catch(ex => console.error(ex));
    }, 1000*60*2);
    //

  setInterval(() => {

    const randomString =  generateRandomString(10);
    var myHeaders = new Headers();
    myHeaders.append("Content-Type", "application/json");
    myHeaders.append("Accept", "*/*");
    myHeaders.append("Host", "wai-server-01-qq4qmtq7wc9he4.chinahighlights.cn");
    myHeaders.append("Connection", "keep-alive");

    var raw = JSON.stringify({
       "from": "8618777396951",
       "to": "8613317835586",
       "content": randomString + "-setInterval(3min) 发送：" + new Date().toString()
    });

    var requestOptions = {
       method: 'POST',
       headers: myHeaders,
       body: raw,
       redirect: 'follow'
    };

    fetch("http://wai-server-01-qq4qmtq7wc9he4.chinahighlights.cn/api/v1/channels/send", requestOptions)
      .then(rsp => rsp.json())
      .then(json => console.info('8613317835586: ', json))
      .catch(ex => console.error(ex));
    }, 1000*60*3);
    //

  setInterval(() => {

    const randomString =  generateRandomString(10);
    var myHeaders = new Headers();
    myHeaders.append("Content-Type", "application/json");
    myHeaders.append("Accept", "*/*");
    myHeaders.append("Host", "wai-server-01-qq4qmtq7wc9he4.chinahighlights.cn");
    myHeaders.append("Connection", "keep-alive");

    var raw = JSON.stringify({
       "from": "8618777396951",
       "to": "8617607735120",
       "content": randomString + "-setInterval(5min) 发送：" + new Date().toString()
    });

    var requestOptions = {
       method: 'POST',
       headers: myHeaders,
       body: raw,
       redirect: 'follow'
    };

    fetch("http://wai-server-01-qq4qmtq7wc9he4.chinahighlights.cn/api/v1/channels/send", requestOptions)
      .then(rsp => rsp.json())
      .then(json => console.info('8613317835586: ', json))
      .catch(ex => console.error(ex));
    }, 1000*60*5);
}

start();