點擊等號沒反應，求解
<!DOCTYPE?html>
<html>
?<head>
??<title>?事件</title>??
??<script?type="text/javascript">
???function?count(){
???????
????//獲取第一個輸入框的值
????var?val1?=?document.getElementById("txt1").value;
????
//獲取第二個輸入框的值
var?val2?=?document.getElementById("txt2").value;
//獲取選擇框的值
var?val3?=?document.getElementById("select").value;
//獲取通過下拉框來選擇的值來改變加減乘除的運算法則
var?v?="";
switch(varl3){
????case?"+":
????????v?=?parseInt(val1)?+?parseInt(val2);
????????break;
????case?"-":
????????v?=??parseInt(val1)?-?parseInt(val2);
????????break;
????case?"*":
????????v?=??parseInt(val1)?*?parseInt(val2);
????????break;
????case?"/":
????????v?=??parseInt(val1)?/?parseInt(val2);
????????break;
}
????//設置結果輸入框的值?
????document.getElementById("fruit").value?=?v;
???}
??</script>?
?</head>?
?<body>
???<input?type='text'?id='txt1'?/>?<br/>
???<select?id='select'>
<option?value='+'>+</option>
<option?value="-">-</option>
<option?value="*">*</option>
<option?value="/">/</option>
???</select><br/>
???<input?type='text'?id='txt2'?/>?<br/>
???<input?type='button'?value='?=?'?onclick="count()"?/>?<!--通過?=?按鈕來調用創建的函數，得到結果-->?
???<br/>
???<input?type='text'?id='fruit'?/>???
?</body>
</html>沒看出哪里錯了，幫忙看看
2017-03-19
?switch(varl3) 改成：?switch(val3)