所以我在玩一些数学函数,我遇到了一个问题。我有几个输入“onClick”,但我的问题是: 我可以做一次加工,但是如果我再试一次,那就不行了。然后我必须刷新页面才能尝试新值。任何人都知道如何解决这个问题?
<!doctype html>
<html>
<head>
</head>
<body>
<h1>Quadratic equation Calculator</h1>
</br>
</br>
<p>Select A value</p> <input id="a"></input>
<p>Select B value</p> <input id="b"></input>
<p>Select C value</p> <input id="c"></input></br>
<button class="knapp" onClick="a();b();c();abc(a,b,c)">Calculate</button>
<button class="knapp" onClick="location.href=location.href">Refresh</button>
<h1 id="svar"></h1>
<h1 id="svar2"></h1>
<script>
function a() {
a = document.getElementById("a").value;
return a;
}
function b() {
b = document.getElementById("b").value;
return b;
}
function c() {
c = document.getElementById("c").value;
return c;
}
function abc(a,b,c) {
var minB = -b;
var underRot = Math.pow(b,2)-(4*a*c);
var rot = Math.sqrt(underRot);
var formelPluss = (minB + rot)/(2*a);
var formelMinus = (minB - rot)/(2*a);
document.getElementById("svar").innerHTML = "X1 = " + formelPluss;
document.getElementById("svar2").innerHTML = "X2 = " + formelMinus;
}
</script>
</body>
</html>
答案 0 :(得分:1)
您需要使用let
将它们设置为变量。
<!doctype html>
<html>
<head>
</head>
<body>
<h1>Quadratic equation Calculator</h1>
</br>
</br>
<p>Select A value</p> <input id="a"></input>
<p>Select B value</p> <input id="b"></input>
<p>Select C value</p> <input id="c"></input></br>
<button class="knapp" onClick="a();b();c();abc(a,b,c)">Calculate</button>
<button class="knapp" onClick="location.href=location.href">Refresh</button>
<h1 id="svar"></h1>
<h1 id="svar2"></h1>
<script>
function a() {
let a = document.getElementById("a").value;
return a;
}
function b() {
let b = document.getElementById("b").value;
return b;
}
function c() {
let c = document.getElementById("c").value;
return c;
}
function abc(a,b,c) {
var minB = -b;
var underRot = Math.pow(b,2)-(4*a*c);
var rot = Math.sqrt(underRot);
var formelPluss = (minB + rot)/(2*a);
var formelMinus = (minB - rot)/(2*a);
document.getElementById("svar").innerHTML = "X1 = " + formelPluss;
document.getElementById("svar2").innerHTML = "X2 = " + formelMinus;
}
</script>
</body>
</html>
答案 1 :(得分:0)
这是我的方法:
function abc(a,b,c) {
a = document.getElementById("a").value;
b = document.getElementById("b").value;
c = document.getElementById("c").value;
var minB = -b;
var underRot = Math.pow(b,2)-(4*a*c);
var rot = Math.sqrt(underRot);
var formelPluss = (minB + rot)/(2*a);
var formelMinus = (minB - rot)/(2*a);
document.getElementById("svar").innerHTML = "X1 = " + formelPluss;
document.getElementById("svar2").innerHTML = "X2 = " + formelMinus;
}
<!doctype html>
<html>
<head>
</head>
<body>
<h1>Quadratic equation Calculator</h1>
</br>
</br>
<p>Select A value</p> <input id="a"></input>
<p>Select B value</p> <input id="b"></input>
<p>Select C value</p> <input id="c"></input></br>
<button class="knapp" onClick="abc(a,b,c)">Calculate</button>
<h1 id="svar"></h1>
<h1 id="svar2"></h1>
</body>
</html>
答案 2 :(得分:0)
你有一些不必要的电话。我已经编辑了你的代码
<!doctype html>
<html>
<head>
</head>
<body>
<h1>Quadratic equation Calculator</h1>
</br>
</br>
<p>Select A value</p> <input id="a"></input>
<p>Select B value</p> <input id="b"></input>
<p>Select C value</p> <input id="c"></input></br>
<button class="knapp" onClick="abc()">Calculate</button>
<button class="knapp" onClick="location.href=location.href">Refresh</button>
<h1 id="svar"></h1>
<h1 id="svar2"></h1>
<script>
function abc() {
var a = document.getElementById("a").value;
var b = document.getElementById("b").value;
var c = document.getElementById("c").value;
var minB = -b;
var underRot = Math.pow(b,2)-(4*a*c);
var rot = Math.sqrt(underRot);
var formelPluss = (minB + rot)/(2*a);
var formelMinus = (minB - rot)/(2*a);
document.getElementById("svar").innerHTML = "X1 = " + formelPluss;
document.getElementById("svar2").innerHTML = "X2 = " + formelMinus;
}
</script>
</body>
</html>
答案 3 :(得分:0)
代码的主要问题是,您将函数声明为“a”,“b”和“c”,并将返回值存储在同一个变量中。重命名变量或函数名称。它将解决问题。或者您可以使用let关键字定义变量的范围。
这里是修改后的代码:
function a1() {
a = document.getElementById("a").value;
return a;
}
function b1() {
b = document.getElementById("b").value;
return b;
}
function c1() {
c = document.getElementById("c").value;
return c;
}
答案 4 :(得分:0)
由于您正在重新定义自己的函数a
,b
和c
,因为您使用与输入值变量中的函数相同的名称,所以你只需改变它的名字:
var valueOfA, valueOfB, valueOfC;
function a() {
valueOfA = document.getElementById("a").value;
return valueOfA;
}
function b() {
valueOfB = document.getElementById("b").value;
return valueOfB;
}
function c() {
valueOfC = document.getElementById("c").value;
return valueOfC;
}
然后在计算函数中使用新创建的变量而不是旧函数:
<button class="knapp" onClick="a();b();c(); abc(valueOfA, valueOfB, valueOfC)">Calculate</button>
此外,如果您使用a
,b
和c
只是为了返回一个值,您可以使用这样的简化:
function getInputValue(id) {
return document.getElementById(id).value;
}
并像这样使用它:
<button class="knapp" onClick="abc(getInputValue('a'), getInputValue('b'), getInputValue('c'));">Calculate</button>
完整的代码片段是:
<!doctype html>
<html>
<head>
</head>
<body>
<h1>Quadratic equation Calculator</h1>
</br>
</br>
<p>Select A value</p> <input id="a" />
<p>Select B value</p> <input id="b" />
<p>Select C value</p> <input id="c" /><br />
<button class="knapp" onClick="abc(getInputValue('a'), getInputValue('b'), getInputValue('c'))">Calculate</button>
<button class="knapp" onClick="location.href=location.href">Refresh</button>
<h1 id="svar"></h1>
<h1 id="svar2"></h1>
<script>
function getInputValue(id) {
return document.getElementById(id).value;
}
function abc(a, b, c) {
//console.log(a, b, c);
var minB = -b;
var underRot = Math.pow(b,2)-(4*a*c);
var rot = Math.sqrt(underRot);
var formelPluss = (minB + rot)/(2*a);
var formelMinus = (minB - rot)/(2*a);
document.getElementById("svar").innerHTML = "X1 = " + formelPluss;
document.getElementById("svar2").innerHTML = "X2 = " + formelMinus;
}
</script>
</body>
&#13;