如何在 Javascript 中不断添加数字？
我能够计算出用户输入的内容，并将其汇总。totaal1但是，totaal2在这种情况下，如何计算 Javascript 在 div id 中打印的内容？
<HTML>
<HEAD>
<TITLE>Hier vul je de titel van je pagina in.</TITLE>
</HEAD>
<BODY>
<script type="text/javascript">
function test() {
var getal1 = ( document.javascript.normaal1.value - 0 );
var getal2 = ( document.javascript.alu1.value - 0 );
var getal3 = ( document.javascript.rvs1.value - 0 );
var getal4 = ( document.javascript.normaal2.value - 0 );
var getal5 = ( document.javascript.alu2.value - 0 );
var getal6 = ( document.javascript.rvs2.value - 0 );
var getal7 = 'totaal1' + 'totaal2';
document.getElementById('totaal1').innerHTML = (getal1*0.40) + (getal2*0.50) + (getal3*0.60);
document.getElementById('totaal2').innerHTML = (getal4*0.40) + (getal5*0.50) + (getal6*0.60);
document.getElementById('totaal3').innerHTML = getal7;
}
</script>
<form method='post' name='javascript'>
<table border="1">
<tr>
<th>Ring</th>
<th>Normaal Per stuk 0,40 </th>
<th>Aluminium Per stuk 0,50 </th>
<th>RVS Per stuk 0,60 </th>
<th>Totaal</th>
</tr>
<tr>
<td>1mm</td>
<td><input type='text' name='normaal1' onchange='test()' ></td>
<td><input type='text' name='alu1' onchange='test()' ></td>
<td><input type='text' name='rvs1' onchange='test()' ></td>
<td><div id="totaal1"> </div></td>
</tr>
<tr>
<td>2mm</td>
<td><input type='text' name='normaal2' onchange='test()' ></td>
<td><input type='text' name='alu2' onchange='test()' ></td>
<td><input type='text' name='rvs2' onchange='test()' ></td>
<td><div id="totaal2"> </div></td>
</tr>
<tr>
<td>Totaal</td>
<td> </td>
<td> </td>
<td> </td>
<td><div id="totaal3"> </div></td>
</tr>
</form>
</table>
</BODY>
</HTML>