<script type="text/javascript">
function count(){
var a =document.getElementById("txt1").value;
var b =document.getElementById("txt2").value;
var c =document.getElementById("select").value;
var d ="";
switch(c){
case '+':
d = parseFloat(a) + parseFloat(b);
break;
case "-"：
d = parseFloat(a) - parseFloat(b);
break;
case "*":
d = parseFloat(a) * parseFloat(b);
break;
default:
d = parseFloat(a) / parseFloat(b);
break;
}
document.getElementById("fruit").value = d;
}
</script>
</head>
<body>
<input type='text' id='txt1' />
<select id='select'>
<option value='+'>+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type='text' id='txt2' />
<input type='button' value=' = ' onclick="count()"/>
<input type='text' id='fruit' />
</body>
慕娘7231430
相关分类