<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>计算</title>
</head>
<script>
function get_num()
{
aValue = document.getElementsByName('a')[0].value;
bValue = document.getElementsByName('b')[0].value;
document.getElementsByName('c')[0].value = aValue * bValue;
}
</script><body>
<form name="form1" method="post" action="">
<p>
数a<input type="text" name="a" onblur="get_num()">
</p>
<p>
数b<input type="text" name="b" onblur="get_num()">
</p>
<p>
积c<input type="text" name="c">
</p>
</form>
</body>
</html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>计算</title>
</head>
<script>
function get_num()
{
aValue = document.getElementsByName('a')[0].value;
bValue = document.getElementsByName('b')[0].value;
document.getElementsByName('c')[0].value = aValue * bValue;
}
</script><body>
<form name="form1" method="post" action="">
<p>
数a<input type="text" name="a" onblur="get_num()">
</p>
<p>
数b<input type="text" name="b" onblur="get_num()">
</p>
<p>
积c<input type="text" name="c">
</p>
</form>
</body>
</html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>计算</title>
<script>
function f1()
{
alert(eval((document.all.Text1.value)*(document.all.Text2.value)))
}
</script>
</head><body>
<form name="form1" method="post" action="" ID=Form1>
<p>
数a<input type="text" name="a" ID=Text1>
</p>
<p>
数b<input type="text" name="b" ID=Text2>
</p>
<p>
<input type="button" onclick=f1()>
</p>
</form>
</body>
</html>
function Ma()
{
if(Num2.value != "")
{
Num3.value = Number(Num1.value)*Number(Num2.value);}
}
</script><body>
<input type="text" id="Num1" onpropertychange="Ma()">*<input type="text" id="Num2" onpropertychange="Ma()">=<input type="text" id="Num3" readonly=>
</body>
</html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>计算</title>
<script language="javascript">
function sumValue(){
var valueA = form1.a.value;
var valueB = form2.b.value;
if(valueA == ""){
valueA = parseFloat(0);
}else{
valueA = parseFloat(valueA);
}
if(valueB = ""){
valueB = parseFloat(0);
}else{
valueB = parseFloat(valueB);
}
form1.c.value = valueA * valueB;
}
</script>
</head><body>
<form name="form1" method="post" action="">
<p>
数a<input type="text" name="a" onblur="sumVaule()">
</p>
<p>
数b<input type="text" name="b" onblur="sumValue()">
</p>
<p>
积c<input type="text" name="c">
</p>
</form>
</body>
</html>
zhiin(┈ Jcan ┈) 的程序也能运行。
tragedy(我要读书)的程序有异常