var exchange = 6.2950;
var price = 361.5;
function Calculate1() {
	var a1 = document.getElementById("a1").value;
	if (!isNaN(a1)) {
		var tmp = a1 * dollar / 31.1035;
		document.getElementById("b1").value = Math.round(parseFloat(tmp) * 100) / 100;
	} else {
		alert("必须是数字");
	}
}
function Calculate2() {
	var a2 = document.getElementById("a2").value;
	if (!isNaN(a2)) {
		tmp = a2 / dollar * 31.1035;
		document.getElementById("b2").value = Math.round(parseFloat(tmp) * 100) / 100;
	} else {
		alert("必须是数字");
	}
}

function Calculate() {
	var gram = document.getElementById("gram");
	var ounce = document.getElementById("ounce");
	if(gram.checked){
		gramCalculate();
	}else{
		ounceCalculate();
	}
}

function gramCalculate(){
	var weight = document.getElementById("weight").value;
	var gram = document.getElementById("gram");
	var rmb = document.getElementById("rmb");
	var dollar = document.getElementById("dollar");
	if (!isNaN(weight)) {
		rmb.value = Math.round(weight*price * 100) / 100;
		dollar.value = Math.round(rmb.value / exchange * 100) / 100;
	} else {
		alert("必须是数字");
	}
}

function ounceCalculate(){
	var weight = document.getElementById("weight").value;
	var rmb = document.getElementById("rmb");
	var ounce = document.getElementById("ounce");
	var dollar = document.getElementById("dollar");
	if (!isNaN(weight)) {
		//盎司转换成克
		var tmp = weight * 31.1035;
		rmb.value = Math.round(tmp*price * 100) / 100;
		dollar.value = Math.round(rmb.value / exchange * 100) / 100;
	} else {
		alert("必须是数字");
	}
}