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<script>
window.onmessage = function(e) {
const id = e.data['id'];
try {
var sw = window.navigator.serviceWorker;
} catch (e) {
window.top.postMessage({
id: id,
result: 'navigator.serviceWorker failed: ' + e.name
}, '*');
return;
}
window.navigator.serviceWorker.getRegistration()
.then(function() {
window.top.postMessage({id: id, result:'ok'}, '*');
})
.catch(function(e) {
window.top.postMessage({
id: id,
result: 'getRegistration() failed: ' + e.name
}, '*');
});
};
</script>