还是不行啊-慕课网

还是不行啊

来源：6-11 编程练习

新人沈琦斌

2016-04-10 18:27

实践练习还是不行，没有结果啊。

求求各位大神帮我看看这段代码哪里出问题了，我快崩溃了。

<!DOCTYPE html>

<html>

<head>

function count(){

var a,b,c,d;

a=parseInt(document.getElementById("txt1").value);

b=parseInt(document.getElementById("txt2").value);

c=document.getElementById("select").value;

switch(c){

case"+":

d=a+b;

break;

case"-":

d=a-b;

break;

case"*":

d=a*b;

break;

case"/":

d=a/b;

break;}

d=document.getElementById("fruit").value

}

</script>

</head>

<body>

</select>

</body>

</html>

我是不是没救了？

写回答关注

4回答

qq_慕神1420022

2022-03-31 15:17:21

唉，这得自己领悟啊！啊多么痛的领悟、、、
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0 0
qq_物是人非事事休_0

2016-04-11 21:22:37

d=document.getElementById("fruit").value是不是写反了，应该是document.getElementById("fruit").value=d，把d值赋值给document.getElementById("fruit").value

0 0
expressqingqing

2016-04-11 13:17:44

<html>
<head>
<title> 事件</title>
<script type="text/javascript">
function count(){
var a=document.getElementById("txt1").value;
var b=document.getElementById("select").value;
var c=document.getElementById("txt2").value;
var d
switch(b){
case '+':
d=parseInt(a)+parseInt(c);
break;
case '-':
d=parseInt(a)-parseInt(c);
break;
case '*':
d=parseInt(a)*parseInt(c);
break;
case '/':
d=parseInt(a)/parseInt(c);
break;
}
document.getElementById("fruit").value=d;
}
</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()"> 
<input type="text" id="fruit">
</body>
</html>

0 0
thirty3

2016-04-10 19:19:35

嘻嘻0.0

0 0

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