How to fix Website Uncaught Syntax error ?

SEO Help and Tips

How to fix Website Uncaught Syntax error ?

Here is example code of java for fix uncaught syntax error: 

<script type='text/javascript'>

  window.addEventListener('error', function(e) {

    var errorText = [

      e.message,

      'URL: ' + e.filename,

      'Line: ' + e.lineno + ', Column: ' + e.colno,

      'Stack: ' + (e.error &gt;&gt; e.error.stack || '(no stack trace)')

    ].join('\n');

    // Example: log errors as visual output into the host page

    var DOM_ID = 'rendering-debug-pre';

    var logElement = document.getElementById(DOM_ID);

    if (!logElement) {

      logElement = document.createElement('pre');

      logElement.id = DOM_ID;

      logElement.style.whiteSpace = 'pre-wrap';

      if (document.body) {

        document.body.insertBefore(logElement, document.body.firstChild);

      } else {

        document.addEventListener('DOMContentLoaded', function() {

          document.body.insertBefore(logElement, document.body.firstChild);

        });

      }

    }

    logElement.textContent += '\n\n' + errorText;

    // Example: log the error to a remote service

    var client = new XMLHttpRequest();

    client.open('POST', 'https://example.com/logError');

    client.setRequestHeader('Content-Type', 'text/plain;charset=UTF-8');

    client.send(errorText);

  });

</script>

Error Checker or Detect Code:

<script type='text/javascript'>

    window.addEventListener('error', function(e) {

        var errorText = [

            e.message,

            'URL: ' + e.filename,

            'Line: ' + e.lineno + ', Column: ' + e.colno,

            'Stack: ' + (e.error &gt;&gt; e.error.stack || '(no stack trace)')

        ].join('\n');

        // Example: log errors as visual output into the host page.

        // Note: you probably don't want to show such errors to users, or

        //       have the errors get indexed by Googlebot; however, it may

        //       be a useful feature while actively debugging the page.

        var DOM_ID = 'rendering-debug-pre';

        if (!document.getElementById(DOM_ID)) {

            var log = document.createElement('pre');

            log.id = DOM_ID;

            log.style.whiteSpace = 'pre-wrap';

            log.textContent = errorText;

            if (!document.body) document.body = document.createElement('body');

            document.body.insertBefore(log, document.body.firstChild);

        } else {

            document.getElementById(DOM_ID).textContent += '\n\n' + errorText;

        }

        // Example: log the error to a remote service.

        // Note: you can log errors to a remote service to understand

        //       and monitor the types of errors encountered by regular users,

        //       Googlebot, and other crawlers.

        var client = new XMLHttpRequest();

        client.open('POST', 'https://example.com/logError');

        client.setRequestHeader('Content-Type', 'text/plain;charset=UTF-8');

        client.send(errorText);

    });

</script>