Javascript-更改文本字段的值
我试图从3个文本字段中获取数据,将它们相乘,然后将值放入另一个文本字段中Javascript-更改文本字段的值,javascript,Javascript,我试图从3个文本字段中获取数据,将它们相乘,然后将值放入另一个文本字段中 <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script type='text/javascript'> function run() { var eq = document.getElementById("Eq"); var m = do
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type='text/javascript'>
function run()
{
var eq = document.getElementById("Eq");
var m = document.getElementById("m1");
var c = document.getElementById("c");
var dT = document.getElementById("dT");
var ek = document.getElementById("Ek");
var v = document.getElementById("v");
if(eq.value.length == 0)
{
var result = parseFloat(m.value) * parseFloat(c.value) * parseFloat(dT.value);
alert(result);
eq.value = result.toString();
}
if(c.value.length == 0)
{
c.value = eq.value / (m.value * dT.value);
}
}
function m1change()
{
var m1 = document.getElementById("m1");
var m2 = document.getElementById("m2");
m2.value = m1.value;
}
function m2change()
{
var m1 = document.getElementById("m1");
var m2 = document.getElementById("m2");
m1.value = m2.value;
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Welcome - ברוכים הבאים</title>
</head>
<body>
<form action="">
<h1>Eq = m * c * ΔT</h1>
<input type="number" max="2147483648" id="Eq" maxlength="10" /> = <input type="number" max="10" class="m" id="m1" maxlength="10" onkeyup="m1change()" /> * <input type="number" max="2147483648" id="cHeat" maxlength="10" /> * <input type="number" max="2147483648" id="dT" maxlength="10" />
<h1>Ek = (m * v²) / 2</h1>
<input type="number" max="2147483648" id="Ek" maxlength="10" /> = (<input type="number" max="10" class="m" id="m2" maxlength="10" onkeyup="m2change()" /> * <input type="number" max="2147483648" id="v" maxlength="10" /><font size="6.5">²</font> ) / 2
<h1>Eh = m * g * h</h1>
<input type="reset" /> <input type="button" onclick="run()" value="Calculate" />
<h6>by X</h6>
</form>
</body>
</html>
函数运行()
{
var eq=document.getElementById(“eq”);
var m=document.getElementById(“m1”);
var c=document.getElementById(“c”);
var dT=document.getElementById(“dT”);
var ek=document.getElementById(“ek”);
var v=document.getElementById(“v”);
如果(等式value.length==0)
{
var结果=parseFloat(m.value)*parseFloat(c.value)*parseFloat(dT.value);
警报(结果);
eq.value=result.toString();
}
如果(c.value.length==0)
{
c、 值=等式值/(m值*dT值);
}
}
函数m1change()
{
var m1=document.getElementById(“m1”);
var m2=document.getElementById(“m2”);
m2.value=m1.value;
}
函数m2change()
{
var m1=document.getElementById(“m1”);
var m2=document.getElementById(“m2”);
m1.值=m2.值;
}
欢迎光临
等式=m*c*ΔT
= * *
埃克=(m*v²)/2
= ( * ² ) / 2
Eh=m*g*h
乘X
它不会提醒结果,所以我假设它停留在结果声明上
我做错了什么
谢谢。您正试图用这行代码获取
#c
的值
var c = document.getElementById("c");
但它不会带着什么回来。没有id为c
的标记。我想你是故意的
var c = document.getElementById("cHeat");
尝试查看此更新的run()函数 您缺少一个文本框,需要获取.value属性。:)
错误控制台窗口中有错误吗?我看不到…尝试在函数正文的第一行中发出警报。它发出警报,因此它进入函数。
document.getElementById(“c”)代码>是否存在?。不是。谢谢,我也知道了。
function run()
{
var eq = document.getElementById("Eq").value;
var m = document.getElementById("m1").value;
var c = document.getElementById("cHeat").value;
var dT = document.getElementById("dT").value;
var ek = document.getElementById("Ek").value;
var m2 = document.getElementById("m2").value;
var v = document.getElementById("v").value;
console.log("eq = " + eq);
console.log("m = " + m);
console.log("c = " + c);
console.log("dT = " + dT);
console.log("ek = " + ek);
console.log("m2 = " + m2);
console.log("v = " + v);
if(eq.length == 0)
{
console.log('a');
var result = parseFloat(m) * parseFloat(c) * parseFloat(dT);
alert(result);
eq = result.toString();
}
if(c.length == 0)
{
console.log('b');
c = eq / (m * dT);
}
}