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                        /JavaScript進(jìn)階篇

無法顯示結(jié)果

<!DOCTYPE?html>
<html>
?<head>
??<title>?事件</title>??
??<script?type="text/javascript">
???function?count(){
???????var?v1=document.getElementById("txt1").value;
???????var?v2=document.getElementById("txt2").value;
???????var?ojbk=document.getElementById("select").value;
???????var??result
???????switch(ojbk){
???????????case="+":
??????????result=parseInt(v1)+parseInt(v2);
??????????break;
??????????case="-":
??????????result=parseInt(v1)-parseInt(v2);
??????????break;
??????????case="*":
??????????result=parseInt(v1)*parseInt(v2);
??????????break;
????????default
??????????result=parseInt(v1)/parseInt(v2);
???????}
???????document.getElementById("fruit").value=result;
????//獲取第一個輸入框的值
?//獲取第二個輸入框的值
?//獲取選擇框的值
?//獲取通過下拉框來選擇的值來改變加減乘除的運(yùn)算法則
????//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>