function injectTcccWebSDK(SdkURL) {
    if (window.tccc) {
      console.warn('The SDK has been initialized. Please confirm whether the initialization is being executed repeatedly');
      return;
    }
    return new Promise((resolve, reject) => {
      const script = document.createElement('script');
      script.setAttribute('crossorigin', 'anonymous');
      // The DomId needs to be rendered into it. If it is filled in, there is no floating window, and the workspace is directly rendered into the specified dom element (XML)
      // To ensure the integrity of the workspace UI, the rendered Dom should have a minimum height of 480px and a minimum width of 760px
      // script.dataset.renderDomId = "renderDom";
      script.src = SdkURL;
      document.body.appendChild(script);
      script.addEventListener('load', () => {
        // JS SDK file loaded successfully. At this point, you can use the global variable "tccc"
        window.tccc.on(window.tccc.events.ready, () => {
          /**
          * TCCC SDK initialization succeeded. At this point, you can call out, listen to inbound events, and use other features.
          * Note ⚠️: Please ensure that the SDK is only initialized once
          * */
          resolve('Initialization succeeded')
        });
        window.tccc.on(window.tccc.events.tokenExpired, ({message}) => {
          console.error('Initialization failed', message)
          reject(message)
        })
      })
    })
}

// Request the interface implemented in step 2  /loginTCCC 
// Note ⚠️: The following is just a code example, it is not recommended to run directly
fetch('/loginTCCC')
  .then(res => res.json())
  .then((res) => {
    const SdkURL = res.SdkURL; // Ensure that the SdkURL is returned by the request, otherwise, unpredictable errors may occur!
    return injectTcccWebSdk(SdkURL);    
  })
  .catch((error) => {
    // Initialization failed
    console.error(error);    
  })