Javascript差異百分比數學

Question

我迷惑了我的自我，甚至無法弄清楚這個基本的數學問題，請幫助我，如果你有空。

我該如何在Javascript中做到這一點？

來源：http://www.calculatorsoup.com/calculators/algebra/percent-difference-calculator.php

(| V1 - V2 |/((V1 + V2)/2)) * 100 

= (| 7606 - 6000 |/((7606 + 6000)/2)) * 100 
= (| 1606 |/(13606/2)) * 100 
= (1606/6803) * 100 
= 0.236072 * 100 

Answer 1

在這裏你去：

Working Example

var a = 10; 
var b = 100; 

function perDiff(a, b) { 
    var avg = (a + b)/2; 
    var diff = a - b; 
    return Math.abs(diff/avg) * 100; 
} 

Answer 2

貌似JordanHendrix打我給它。

function diffPercent(v1, v2) { 
    return (Math.abs(v1- v2)/((v1 + v2)/2)) * 100; 
} 

console.log(diffPercent(7606, 6000)) 
// => 23.3483756 

或

function diffPercent(v1, v2) { 
    var diff = Math.abs(v1 - v2); 
    var sum = v1 + v2; 
    var pc = diff/(sum/2); 
    return pc * 100; 
} 

console.log(diffPercent(7606, 6000)) 
// => 23.3483756