<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
var num1=parseInt(document.getElementById("txt1").value);
var num2=parseInt(document.getElementById("txt2").value);
var select1=document.getElementById("select").value;
var num="";
switch(select1){
case "+":
num=txt1+txt2;
break;
case "-":
num=txt1-txt2;
break;
case "*":
num=txt1*txt2;
break;
case "/":
num=txt1/txt2;
break;
}
document.getElementById('fruit').value=num;
</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>
Misure米叔
江湖書生
相关分类