<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript">
function count(){
var a=document.getElementById('txt1').value;
var b=document.getElementById('txt2').value;
var elect=document.getElementById('select').value;
var result='';
switch("elect"){
case '+':
result = a + b;
break;
case '-':
result=a - b;
break;
case '*':
result=a * b;
break;
default:
result=a / b;
}
document.getElementById("fruit").value=result;
}
</script>
<input type="text " id="txt1"/>
<select id='select'>
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
<input type="text" id="txt2"/>
<input type="button" value=" = " onclick="count()"/ >
<input type="text" id="fruit"/>
</select>
</head>
<body>
</body>
</html>
刚毅87
ahao430