<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count() {
var txt1 = parseInt(document.getElementById('txt1').value); //获取第一个输入框的值
var txt2 = parseInt(document.getElementById('txt2').value); //获取第二个输入框的值
var sel = document.getElementById('select').value; //获取选择框的值
var result = '';
if(sel = '+') {
result = txt1 + txt2;
} else if(sel = '-') {
result = txt1 - txt2;
} else if(sel = '*'){
result = txt1 * txt2;
}
else{
result = txt1 / txt2;
}
document.getElementById('fruit').value = result;
}
</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()' />
<!--通过 = 按钮来调用创建的函数，得到结果-->
<input type='text' id='fruit' />
</body>
</html>
我爱吃牛排
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