<!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 text1 = document.getElementById("txt1").value;
//获取第二个输入框的值
var text2 = document.getElementById("txt2").value;
//获取选择框的值
var selectText = 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(selectText){
case "+":
var result = text1 + text2 ;
break;
case "-":
if(text1 - text2 >0){
var result = parseInt(text1) - parseInt(text2) ;
}else if(text1 - text2 <0){
var result = parseInt(text2) -parseInt(text1);
}
break;
case "*":
var result = parseInt(text1) * parseInt(text2) ;
break;
case "/":
var result = parseInt(text1) /parseInt(text2) ;
break;
}
//设置结果输入框的值
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=' = ' onlcick="count()"/> <!--通过 = 按钮来调用创建的函数,得到结果-->
<input type='text' id='fruit' />
</body>
</html>
<input type='button' value=' = ' onlcick="count()"/>
onlcick 写错了