大神快来快来
<html>
<head>
<title>编程练习</title>
<script type="text/javascript">
function count(){
var a=document.getElementById("txt1").value;
var b=document.getElementById("txt2").value;
var c=document.getElementById("select").value;
var result=document.getElementById("friut");
switch(c){
case "+":
result=a+b;
break;
case"-":
result=a-b;
break;
case"*":
result=a*b;
break;
case="/":
result=a/b;
break;
}
}
</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="=">
<input type="text" id="fruit">
</body>
</html>
为什么按了”=“不出结果呢?
