JS实现简单的二元方程计算器功能示例

时间：2021-05-26

本文实例讲述了JS实现简单的二元方程计算器功能。分享给大家供大家参考，具体如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD><TITLE>二元方程</TITLE><META NAME="Author" CONTENT=""><META NAME="Keywords" CONTENT=""><META NAME="Description" CONTENT=""></HEAD><BODY><SCRIPT LANGUAGE="JavaScript"><!-- Beginvar 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";}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;}// End --></script><form name=fquad> <table align="center"> <tr><td><h2><input name=fa size=4> <font color="#33FF33">x<SUP>2</SUP>+</font> <input name=fb size=4> <font color="#33FF33"> x +</font> <input name=fc size=4> <font color="#33FF33">= 0</font> <input type=button value="求值" onClick="checkQuad()"> <input type=reset value="重填"></h2></td></tr><tr><td><h2> <font color="#33FF33">x<sub>1</sub>=</font><input name=x1 size=45> <font color="#33FF33">x<sub>2</sub>= </font><input name=x2 size=45></h2></td></tr></table></form></BODY></HTML>

PS：这里再为大家推荐几款计算工具供大家进一步参考借鉴：

在线一元函数（方程）求解计算工具：
http://tools.jb51.net/jisuanqi/equ_jisuanqi

科学计算器在线使用_高级计算器在线计算：
http://tools.jb51.net/jisuanqi/jsqkexue

在线计算器_标准计算器：
http://tools.jb51.net/jisuanqi/jsq

更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript数学运算用法总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript数组操作技巧总结》、《JavaScript排序算法总结》、《JavaScript遍历算法与技巧总结》、《JavaScript查找算法技巧总结》及《JavaScript错误与调试技巧总结》

希望本文所述对大家JavaScript程序设计有所帮助。

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