js判断三角形形状哪里写错了

答案:1 悬赏:20

解决时间 2021-02-15 19:38

提问者网友：柠檬香
2021-02-15 12:45

js判断三角形形状哪里写错了

最佳答案

二级知识专家网友：我叫很个性
2021-02-15 13:33

<!DOCTYPE HTML> <html> <head> <meta charset=UTF-8 /> <title>Nothing</title> <style type="text/css"> </style> <script> var Triangle = function (a, b, c) { this.a = a; this.b = b; this.c = c; } Triangle.ISOSCELES = 1; Triangle.EQUILATERAL = 2; Triangle.RIGHTANGLE = 4; Triangle.GENERAL = 6; Triangle.NOTHING = 7; Triangle.prototype.constructor = Triangle; Triangle.prototype.isWhichOne = function () { var a = this.a; var b = this.b; var c = this.c; if (a + b > c && a + c > b && b + c > a && Math.abs (a - b) < c && Math.abs (a - c) { if (a == b && a == c) { return Triangle.EQUILATERAL | Triangle.ISOSCELES; } else if (a * a + b * b == c * c || a * a + c * c == b * b || c * c + b * b == a * a) { if (a == b || a == c || b == c) { return Triangle.RIGHTANGLE | Triangle.ISOSCELES; } return Triangle.RIGHTANGLE; } else if (a == b || a == c || b == c) { return Triangle.ISOSCELES; } else { return Triangle.GENERAL; } } else { return Triangle.NOTHING; } } Triangle.prototype.perimeter = function () { return this.a + this.b + this.c; } Triangle.prototype.area = function () { var a = this.a; var b = this.b; var c = this.c; return 1 / 4 * Math.sqrt (( a + b + c ) * ( a + b - c ) * ( a + c - b ) * ( b + c - a )); } Triangle.translate = function(triangle) { var type = triangle.isWhichOne (); switch (type) { case Triangle.ISOSCELES: alert ("等腰三角形"); break; case ( Triangle.EQUILATERAL | Triangle.ISOSCELES ): alert ("等边三角形 + 等腰三角形"); break; case Triangle.GENERAL: alert ("普通三角形"); break; case ( Triangle.RIGHTANGLE | Triangle.ISOSCELES ): alert ("直角三角形 + 等腰三角形"); break; case Triangle.RIGHTANGLE: alert ("直角三角形"); break; default: alert ("不构成三角形"); break; } if (type != Triangle.NOTHING) { alert ("周长是：" + triangle.perimeter ()); alert ("面积是：" + triangle.area ()); } } var main = function () { var a = parseInt (document.getElementById('text1').value); var b = parseInt (document.getElementById('text2').value); var c = parseInt (document.getElementById('text3').value); var triangle = new Triangle (a, b, c); Triangle.translate (triangle); } </script> </head> <body> <table> <tr> <td>第一条边:</td> <td><input type="text" id="text1" /> </td> </tr> <tr> <td>第二条边:</td> <td><input type="text" id="text2" /> </td> </tr> <tr> <td>第三条边:</td> <td><input type="text" id="text3" /> </td> </tr> <tr> <td><input type="button" onclick="main();" value="判断" /> </td> </tr> </table> </body> </html>

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