// The error handling function ensures that event processes run normally in case of JS load or initialization errors.
// Define the function before the script loads
function loadErrorCallback() {
    var appid = 'CaptchaAppId';
    // Generate a disaster recovery ticket or use another handling technique
    var ticket = 'trerror_1001_' + appid + '_' + Math.floor(new Date().getTime() / 1000);
    callback({
        ret: 0,
        randstr: '@'+ Math.random().toString(36).substr(2),
        ticket,
        errorCode: 1001,
        errorMessage: 'jsload_error',
    });
}

try {
    // Generate a CAPTCHA object
    var captcha = new TencentCaptcha(document.getElementById('cap_iframe'), 'Your CAPTCHA's CaptchaAppId', callback, {});
    // Call the method to show the CAPTCHA
    captcha.show(); 
} catch (error) {
    // Load error. Call the CAPTCHA js load error handling function.
    loadErrorCallback();
}

function callback(res) {
    // res (CAPTCHA is closed by the user) = {ret: 2, ticket: null}
    // res (Verification is successful) = {ret: 0, ticket: "String", randstr: "String"}
    // res (Request error. A disaster recovery ticket with the prefix trerror_ is returned.) = {ret: 0, ticket: "String", randstr: "String",  errorCode: Number, errorMessage: "String"}
    if (res.ticket){
        // Handle based on errorCode
        if(res.errorCode === xxxxx){
           // Customize the disaster recovery logic (for example, skip this verification)
        }
      }
}

{
  "Response": {
      "Error": {
          "Code": "InternalError",
          "Message": "An internal error has occurred. Retry your request. If the problem persists, contact us."
      },
      "RequestId": "xxxxxxxxxxx"
  }
}

{
  "Response": {
      "CaptchaCode": 26,
      "CaptchaMsg": "System busy. For more information, please see the Captcha documentation. Search for the keyword "DescribeCaptchaResult", and check the description of the CaptchaCode field in the output parameters",
      "EvilLevel": 0,
      "GetCaptchaTime": 0,
      "RequestId": "xxxxxxxxxxx"
  },
  "retcode": 0,
  "retmsg": "ok"
}