<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
//获取第一个输入框的值
var one = parseInt(document.getElementById("txt1").value);
//获取第二个输入框的值
var two = parseInt(document.getElementById("txt2").value);
//获取选择框的值
var sel = document.getElementById("select").value;
switch(sel){
case "+":
var sum = one + two;
document.getElementById("fruit").value = sum;
break;
case "-":
var sum = one - two;
document.getElementById("fruit").value = sum;
break;
case "*":
var sum = one * two;
document.getElementById("fruit").value = sum;
break;
case "/":
var sum = one / two;
document.getElementById("fruit").value = sum;
break;
}
//获取通过下拉框来选择的值来改变加减乘除的运算法则
//设置结果输入框的值
}
</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' onfocus="count()"/>
</body>
</html>
kubert桥泊
2014-10-21
举报
0/150
提交
取消
