如何使用JavaScript中的原型

Question

我一直在使用的JavaScript

function ComplexNumber(real,imaginary) { 
    this.real = real; 
    this.imaginary = imaginary; 
} 
ComplexNumber.prototype = { 
mult: function() { 
     var multiplier = arguments[0]; 
     if(arguments.length != 1) 
       multiplier = new ComplexNumber(arguments[0], arguments[1]); 
     return new ComplexNumber(this.real * multiplier.real - this.imaginary * multiplier.imaginary,      
     this.real * multiplier.imaginary + this.imaginary * multiplier.real);    
    }, 
toString: function() { 
     return this.real + " + " + this.imaginary + "j"; 
     } 
}, 
var complexA = new ComplexNumber(5, 8), 
complexB = new ComplexNumber(3, 4), 
complexSum = complexA.mult(complexB); 
console.log(complexSum.toString()); 

我要創建的複數我試圖分裂原型創建複雜功能的一個乘法將複雜的數字，但它沒有工作... 以下是我的div功能：

div : function(){ 
     var multiplier = arguments[0]; 
     if(arguments.length != 1) 
       multiplier = new ComplexNumber(arguments[0], arguments[1]); 

     return new ComplexNumber((this.real * multiplier.real - this.imaginary * multiplier.imaginary,      
     this.real * multiplier.imaginary + this.imaginary * multiplier.real)/(((this.real)*(this.real))) +((this.multiplier)*(this.multiplier))); 
    }, 

Answer 1

根據

(a+ib)/(c+id)=(ac+bd+i(bc-ad))/(c^2+d^2) 

配方，你需要這個：

var det = multiplier.real*multiplier.real + multiplier.imaginary * multiplier.imaginary; 
return new ComplexNumber(
    (this.real * multiplier.real + this.imaginary * multiplier.imaginary)/det,      
    (this.imaginary * multiplier.real - this.real * multiplier.imaginary)/det 
);