这篇文章主要介绍了基于代数方程库Algebra.js解二元一次方程功能,结合具体实例形式分析了方程库Algebra.js计算方程的具体使用技巧,需要的朋友可以参考下
本文实例讲述了基于代数方程库Algebra.js解二元一次方程功能。分享给大家供大家参考,具体如下:
假设二元一次方程如下:
x + y = 11 x - y = 5
解方程如下:
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <title>测试algebra函数库(解两元一次方程)</title> <script src="js/algebra.min.js"></script> <script type="text/javascript"> var Fraction = algebra.Fraction; var Expression = algebra.Expression; var Equation = algebra.Equation; //======================================= var x1 = algebra.parse("x+y=11"); var answer1 = x1.solveFor("y"); //console.log("y = " + answer1.toString()); var x2 = algebra.parse("x-y=5"); var answer2 = x2.solveFor("y"); //console.log("y = " + answer2.toString()); //================================================= //解出X值 var eq = new Equation(answer1, answer2); console.log("x表达式:" + eq.toString()); var answerX = eq.solveFor("x"); console.log("解出X的值为:" + answerX.toString()); //================================================= //解出Y值(把x的值代入x1或x2) eq = x1.eval({ x: answerX }); console.log("y表达式:" + eq.toString()); var answerY = eq.solveFor("y"); console.log("解出Y的值为:" + answerY.toString()); </script> </head> <body> </body> </html>
控制台输出:
x表达式:-x + 11 = x - 5 解出X的值为:8 y表达式:y + 8 = 11 解出Y的值为:3
代码写得很粗旷,无任何包装。看得懂就好。
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