什么鬼?。?/h1>
<!DOCTYPE html>
<html>
?<head>
? <title> 事件</title> ?
? <script type="text/javascript">
?? function count()
?? {?? ?
??? var text1=document.getElementById("text1").value;
?? ?var text2=document.getElementById("text2").value;
?? ?var fu=document.getElementById("select").value;
??? var tu="";
?? ?switch(fu)
??? {
??????? case "+": tu = parseFloat(text1) + parseFloat(text2); break;
??????? case "-":tu=parseFloat(text1) - parseFloat(text2); break;
??????? case "*":tu=parseFloat(text1) * parseFloat(text2); break;
??????? default:tu=parseFloat(text1) / parseFloat(text2); break;
??? }
??? //設置結(jié)果輸入框的值
???? document.getElementById("fruit").value = tu;
?? }
? </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>
<!DOCTYPE html>
<html>
?<head>
? <title> 事件</title> ?
? <script type="text/javascript">
?? function count()
?? {?? ?
??? var text1=document.getElementById("text1").value;
?? ?var text2=document.getElementById("text2").value;
?? ?var fu=document.getElementById("select").value;
??? var tu="";
?? ?switch(fu)
??? {
??????? case "+": tu = parseFloat(text1) + parseFloat(text2); break;
??????? case "-":tu=parseFloat(text1) - parseFloat(text2); break;
??????? case "*":tu=parseFloat(text1) * parseFloat(text2); break;
??????? default:tu=parseFloat(text1) / parseFloat(text2); break;
??? }
??? //設置結(jié)果輸入框的值
???? document.getElementById("fruit").value = tu;
?? }
? </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>
2016-01-17
..........txt1 txt2