在线⼀元⼆次⽅程计算器实例（⽅程计算器在线计算）复制代码代码如下:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html" charset="utf-8">
<title>在线⼀元⼆次⽅程式计算器</title>
</head>
<body>
<form name="fquad">
<p align="center">解⼆次⽅程式计算<br>
</p>
<table align="center">
<tbody>
<tr>
<td bgcolor="#990000">
<h2><font color="#ffffff"><input size="4" name="fa" type="text"> x<sup>2</sup>+ <input size="4" name="fb"
type="text"> x + <input size="4" name="fc" type="text"> = 0 <input onclick="checkQuad()" type="button" value="解题"> <input type="reset" value="重置"> </font></h2>
<p align="center"><font color="#ffffff" face="Arial"><b>⼀元⼆次⽅程的解法</b></font></p>
</td>
</tr>
<tr>
<td bgcolor="#990000">
<h2><font color="#ffffff">x<sub><a ><font color="#ffffff">1</font></a></sub>=<input size="45" name="x1" type="text"> <br>
x<sub>2</sub>=<input size="45" name="x2" type="text"> </font></h2>
</td>
</tr>
<tr>
</tr>
</tbody>
</table>
</form>
<p align="center">Made by CRoot</p>
<script language="JavaScript">
<!--
var rootparti;
var rootpart;
var det;
var rootparti1;
var rootparti2;
var a;
var b;
var c;
var x1;
var x2;
var i = "i";
function checkQuad() {
var a = document.fquad.fa.value;
var b = document.fquad.fb.value;
var c = document.fquad.fc.value;
if (a == 0 && c != 0) {
x1 = -c / b;
x2 = "Not a quadratic equation, but here is your answer for x";
document.fquad.x1.value=x1;
document.fquad.x2.value=x2;
}
else if (a == "" && c != 0) {
x1 = -c / b;
x2 = "Not a quadratic equation"; document.fquad.x1.value=x1; document.fquad.x2.value=x2;
}
else {
quad();
}
}
function quad() {
var a = document.fquad.fa.value;
var b = document.fquad.fb.value;
var c = document.fquad.fc.value;
det = Math.pow(b,2) - 4 * a * c;
rootpart = Math.sqrt(det) / (2 * a); rootparti = (Math.sqrt(-det) / (2 * a)) + i;
if (parseFloat(rootparti) < 0) {
rootparti1 = rootparti;
rootparti2 = (-1 * parseFloat(rootparti)) + i; }
else {
rootparti1 = (-1 * parseFloat(rootparti)) + i; rootparti2 = rootparti;
}
if (rootparti1 == "1i") {
rootparti1 = i;
rootparti2 = "-i";
}
在线计算器else if (rootparti1 == "-1i") {
rootparti1 = "-i";
rootparti2 = i;
}
if (det == 0) {
x1 = x2 = -b / (2 * a);
}
else if (det > 0) {
x1 = (-b + Math.sqrt(det)) / (2 * a);
x2 = (-b - Math.sqrt(det)) / (2 * a);
}
else if ((-b / (2 * a)) == 0) {
x1 = rootparti1;
x2 = rootparti2;
}
else {
x1 = (-b / (2 * a) + " + " + rootparti1);
x2 = (-b / (2 * a) + " + " + rootparti2);
}
document.fquad.x1.value=x1; document.fquad.x2.value=x2;
}
// will solve for complex numbers
//  -->
</script>
</body>
</html>

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