up vote
2
下面的coding給你做參考！
<html>
<head>
<title>javascript 程式計算加減乘除</title>
</head>
<script type="text/javascript">function showme()
{ for ( i=0; i<1; i++ )
{
v = document.forms[0].elements("a1[" + i + "]").value *1+
document.forms[0].elements("a2[" + i + "]").value *1
document.forms[0].elements("ar[" + i + "]").value = v
}
}
function showme2()
{ for ( i=0; i<1; i++ )
{
f=document.forms[0].elements("b1[" + i + "]").value *1-
document.forms[0].elements("b2[" + i + "]").value *1
document.forms[0].elements("br[" + i + "]").value = f
}
}
function showme3()
{ for ( i=0; i<1; i++ )
{
x =document.forms[0].elements("c1[" + i + "]").value *1*
document.forms[0].elements("c2[" + i + "]").value *1
document.forms[0].elements("cr[" + i + "]").value = x
}
}function showme4()
{ for ( i=0; i<1; i++ )
{
y =document.forms[0].elements("d1[" + i + "]").value *1/
document.forms[0].elements("d2[" + i + "]").value *1
document.forms[0].elements("dr[" + i + "]").value = y
}}
</script>
</head>
<body>
<pre>
javascript 程式計算加減乘除
<form action="test" method="POST"><input name ="a1[0]"> 加 <input name="a2[0]"> = <input name="ar[0]"><input type=button onclick="showme()" value="計算 ">
<input name ="b1[0]"> 減 <input name="b2[0]"> = <input name="br[0]"><input type=button onclick="showme2()" value="計算 ">
<input name ="c1[0]"> 乘 <input name="c2[0]"> = <input name="cr[0]"><input type=button onclick="showme3()" value="計算 ">
<input name ="d1[0]"> 除 <input name="d2[0]"> = <input name="dr[0]"><input type=button onclick="showme4()" value="計算 "> </form>
</pre>
</body>
</html>
up vote
2
<html>
<head>
<script type="text/javascript">
function add() {
var text1_val = parseInt(document.getElementById('text1').value);//取得text1欄位的值
//運算式
var value = text1_val+1;
document.getElementById('text2').value=value;//運算後資料放到text2欄位
}
</script>
</head>
<body>
text1輸入的數字都會自動加1到text2(點選enter或滑鼠點選其他欄位時觸發)<br>
text1:<input type="text" id="text1" onchange="add()" onkeydown="if (event.keyCode == 13) add()"/><br>
text2:<input type="text" id="text2" /><br>
</body>
</html>
不用太感謝我
會員登入
(先登入會員才能回覆留言喔!)