超市购物结算

<script>
	function calculation() {
		var shampooPrice = parseInt(document.getElementById("shampoo").value);
		var instantNoodlesPrice = parseInt(document.getElementById("instantNoodles").value);
		var penPrice = parseInt(document.getElementById("pen").value);
		var totalPrice = shampooPrice + instantNoodlesPrice + penPrice;
		document.getElementById("totalPrice").value = totalPrice;

		var receivedMoney = 100;
		var change = receivedMoney - totalPrice;
		document.getElementById("change").value = change;
	}
</script>