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                        /JavaScript進階篇

能幫我看看嗎，我找了半天沒找到哪里錯了

<!DOCTYPE?html>
<html>
?<head>
??<title>?事件</title>??
??<script?type="text/javascript">
???function?count(){
????var?otxt1=?document.getElementById("txt1").value;??
????//獲取第一個輸入框的值
????var?otxt2=document.getElementById("txt2").value;
	//獲取第二個輸入框的值
????var?oselect=document.getElementById("select").value;
????var?result"";
	//獲取選擇框的值
????switch(oselect){
????????case?"+":
????????result=parseInt(otxt1)?+?parseInt(otxt2);
????????break;
????????case?"-":
????????result=parseInt(otxt1)?-?parseInt(otxt2);
????????break;
????????case?"*":
????????result=parseInt(otxt1)?*?parseInt(otxt2);
????????break;
????????default
????????result=parseInt(otxt1)?/?parseInt(otxt2);
????}
	//獲取通過下拉框來選擇的值來改變加減乘除的運算法則
????document.getElementById("fruit").value=result;
????//設(shè)置結(jié)果輸入框的值?
????
???}
??</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()"/>?<!--通過?=?按鈕來調(diào)用創(chuàng)建的函數(shù)，得到結(jié)果-->?
???<input?type='text'?id='fruit'?/>???
?</body>
</html>