head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script>
function math()
{
a=eval(avalue.value);
b=eval(bvalue.value);
alert("x="+eval(yvalue.value));
}
</script>
</head>
<body>
<div>
x=<input id=xvalue value="a+b"></input><br>
a=<input id=avalue value=1></input><br>
b=<input id=bvalue value=1.5></input><br>
<input type=button value="计算" onclick="math()"></input> <br >
</div>
<div>
x=<input id=xvalue value="a-b"></input><br>
a=<input id=avalue value=1></input><br>
b=<input id=bvalue value=1.5></input><br>
<input type=button value="计算" onclick="math()"></input> <br >
</div></body>
望高手替我解决下,怎么同时实现加减法。看看哪错了,我是新手!
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script>
function math()
{
a=eval(avalue.value);
b=eval(bvalue.value);
alert("x="+eval(yvalue.value));
}
</script>
</head>
<body>
<div>
x=<input id=xvalue value="a+b"></input><br>
a=<input id=avalue value=1></input><br>
b=<input id=bvalue value=1.5></input><br>
<input type=button value="计算" onclick="math()"></input> <br >
</div>
<div>
x=<input id=xvalue value="a-b"></input><br>
a=<input id=avalue value=1></input><br>
b=<input id=bvalue value=1.5></input><br>
<input type=button value="计算" onclick="math()"></input> <br >
</div></body>
望高手替我解决下,怎么同时实现加减法。看看哪错了,我是新手!
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档 </title>
<script>
function math(index)
{
a=parseFloat(document.getElementById("avalue"+index).value);
b=parseFloat(document.getElementById("bvalue"+index).value);
alert("x="+eval(document.getElementById("xvalue"+index).value));
}
</script>
</head>
<body>
<div>
x= <input id=xvalue1 value="a+b"> </input> <br>
a= <input id=avalue1 value=1> </input><br>
b= <input id=bvalue1 value=1.5> </input><br>
<input type=button value="计算" onclick="math(1)"> </input> <br >
</div>
<div>
x= <input id=xvalue2 value="a-b"> </input> <br>
a= <input id=avalue2 value=1> </input> <br>
b= <input id=bvalue2 value=1.5> </input> <br>
<input type=button value="计算" onclick="math(2)"> </input> <br >
</div> </body>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档 </title>
<script>
function mathadd()
{
var a=document.getElementById('avalue').value;
var b=document.getElementById('bvalue').value;
var oper = document.getElementById('xvalue').value;
r = oper.replace(/a/, a);
r = r.replace(/b/, b);
alert(r+"="+eval(r));
}
function mathplus()
{
var a=document.getElementById('cvalue').value;
var b=document.getElementById('dvalue').value;
var oper = document.getElementById('yvalue').value;
r = oper.replace(/a/, a);
r = r.replace(/b/, b);
alert(r+"="+eval(r));
}
</script>
</head>
<body>
<div>
x= <input id=xvalue value="a+b"> </input> <br>
a= <input id=avalue value=1> </input> <br>
b= <input id=bvalue value=1.5> </input> <br>
<input type=button value="计算" onclick="mathadd()"> </input> <br >
</div>
<div>
x= <input id=yvalue value="a-b"> </input> <br>
a= <input id=cvalue value=1> </input> <br>
b= <input id=dvalue value=1.5> </input> <br>
<input type=button value="计算" onclick="mathplus()"> </input> <br >
</div></body>
</html>