Embed the following code in the head TAB of the business-critical entry page
<script type="text/javascript">
(function(){
window._fmOpt = {
success: function(data) {
console.log('blackBox: ', data)
}
};
var fm = document.createElement('script');
fm.type = 'text/javascript'; fm.async = true;
fm.src = 'Base URL' + '?t=' + (new Date().getTime()/3600000).toFixed(0);
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(fm, s);
})();
</script>1.Create Base URL
2.Copy Base URL
if (navigator.geolocation) {
// The first execution will trigger the pop-up box for authorization
navigator.geolocation.getCurrentPosition(
function () {},
function () {},
);
} else {
// The current environment does not support obtaining geographical location information
}The synchronous method may increase the probability of generating a degraded "blackBox". Please use it with caution in combination with the business scenario.
if (window._fmOpt && window._fmOpt.getinfo) {
// Synchronously obtain the blackBox
var your_blackBox = window._fmOpt.getinfo();
} else {
// JSSDK has not been loaded completely
}Obtain by source code file
/**
* TrustDeviceJs Pro v4.2.7 - Copyright (c) TrustDeviceJs, Inc, 2026 (https://www.trustdecision.com/solutions/trustdevice)
*/Obtain by code in runtime
window._fmOpt.sdkVersion;