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表单动态计算

ipan 2008-04-14 11:25:22

<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td>A
<input type="text" name="A" id="A" /></td>
<td>B
<input type="text" name="B" id="B" /></td>
</tr>
</table>
C=
<input type="text" name="C" id="C" />
实现用户在A，B中输入，C立刻计算出结果

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切换为时间正序

当前发帖距今超过3年，不再开放新的回复

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zl_c 2008-04-15

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<html xmlns="http://www.w3.org/1999/xhtml"> 

<head> 

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 

<title>简易计算</title> 

</head> 

<script language="javascript">

function ShowRe()

{    

    document.getElementById("C").value = Number(document.getElementById("A").value) - Number(document.getElementById("B").value)

}

</script>

<body > 

<table border="0" cellspacing="0" cellpadding="0"> 

    <tr> 

        <td>A <input type="text" name="A" value="0" id="A"  onkeyup="ShowRe()" /> </td> 

        <td>B  <input type="text" name="B" value="0" id="B" onkeyup="ShowRe()" /> </td> 

    </tr> 

</table> 

C=<input type="text" name="C" id="C" value="0" /> 

</body> 

</html>

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ipan 2008-04-15

你给的代码出错了

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zl_c 2008-04-14



function ShowRe()

{    

    document.getElementById("C").value = Number(document.getElementById("A").value) - Number(document.getElementById("B").value)

}

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zl_c 2008-04-14

减法的：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<html xmlns="http://www.w3.org/1999/xhtml"> 

<head> 

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 

<title>简易计算</title> 

</head> 

<script language="javascript">

function ShowRe()

{    

    document.getElementById("C").value = Number(document.getElementById("A").value) － Number(document.getElementById("B").value)

}

</script>

<body > 

<table border="0" cellspacing="0" cellpadding="0"> 

    <tr> 

        <td>A <input type="text" name="A" value="0" id="A"  onkeyup="ShowRe()" /> </td> 

        <td>B  <input type="text" name="B" value="0" id="B" onkeyup="ShowRe()" /> </td> 

    </tr> 

</table> 

C=<input type="text" name="C" id="C" value="0" /> 

</body> 

</html>

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zl_c 2008-04-14

做加法的：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<html xmlns="http://www.w3.org/1999/xhtml"> 

<head> 

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 

<title>简易计算</title> 

</head> 

<script language="javascript">

function ShowRe()

{	

	document.getElementById("C").value = Number(document.getElementById("A").value) + Number(document.getElementById("B").value)

}

</script>

<body > 

<table border="0" cellspacing="0" cellpadding="0"> 

	<tr> 

		<td>A <input type="text" name="A" value="0" id="A"  onkeyup="ShowRe()" /> </td> 

		<td>B  <input type="text" name="B" value="0" id="B" onkeyup="ShowRe()" /> </td> 

	</tr> 

</table> 

C=<input type="text" name="C" id="C" value="0" /> 

</body> 

</html>