java编写一个图形用户界面的计算器
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<html>
<script type="text/javascript">
function compute(){
var numA = parseInt(document.getElementById("numA").value);
var numB = parseInt(document.getElementById("numB").value);
var sel = document.getElementById("sel").value;
var result;
document.getElementById("result").value = "";
if(isNaN(numA) || isNaN(numB)){
alert("请输入两个数字！");
}else{
if(sel == "+"){
result = numA + numB;
}else if(sel == "-"){
result = numA - numB;
}else if(sel == "*"){
result = numA * numB;
}else if(sel == "/" && numB != 0){
result = parseFloat(numA / numB);
}else{
result = 0;
}
document.getElementById("result").value = result;
}
}
</script>
<body>
<table>
<tr>
<td><input id="numA" type="text" size="12"></td>
<td width = "80" align = "center"><select id="sel">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</td>
<td><input id="numB" type="text" size="12"></td>
<td width = "35" align = "center"><input id="submit" type="submit" value=" = " onclick="compute();"></td>
<td><input id="result" type="text" size="12"></td>
</tr>
</table>
</body>
</html>
<script type="text/javascript">
function compute(){
var numA = parseInt(document.getElementById("numA").value);
var numB = parseInt(document.getElementById("numB").value);
var sel = document.getElementById("sel").value;
var result;
document.getElementById("result").value = "";
if(isNaN(numA) || isNaN(numB)){
alert("请输入两个数字！");
}else{
if(sel == "+"){
result = numA + numB;
}else if(sel == "-"){
result = numA - numB;
}else if(sel == "*"){
result = numA * numB;
}else if(sel == "/" && numB != 0){
result = parseFloat(numA / numB);
}else{
result = 0;
}
document.getElementById("result").value = result;
}
}
</script>
<body>
<table>
<tr>
<td><input id="numA" type="text" size="12"></td>
<td width = "80" align = "center"><select id="sel">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</td>
<td><input id="numB" type="text" size="12"></td>
<td width = "35" align = "center"><input id="submit" type="submit" value=" = " onclick="compute();"></td>
<td><input id="result" type="text" size="12"></td>
</tr>
</table>
</body>
</html>
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