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 style="text-decoration: none" ><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;
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