<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(value12){
var value12;
//获取第一个输入框的值
var value1 = document.getElementById("txt1").value;
//获取第二个输入框的值
var value2 = document.getElementById("txt2").value;
//获取选择框的值
var operator = document.getElementById("select").value;
//获取通过下拉框来选择的值来改变加减乘除的运算法则
switch(operater){
case "+": value12 = parseInt("value1") + parseInt("value2");break;
case "-": value12 = parseInt("value1") - parseInt("value2"); break;
case "*": value12 = parseInt("value1") * parseInt("value2"); break;
case "/": value12 = parseInt("value1") / parseInt("value2");break;
}
//设置结果输入框的值
document.getElementById("fruit").value = value12;
}
</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>
慕的地6079101
殊途同归0923
SoEasy_1
精慕门9254224
子期不遇
tom的猫
Caballarii
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