index.html

<script>
async function showaddress() {
		const address = await window.mpurse.getAddress();
		console.log(address)
}
showaddress()
</script>




あとは
<script>
async function showaddress() {
		const address = await window.mpurse.getAddress();
		console.log(address)
}
window.onload = function () {
  showaddress()
};
</script>