获取两个数字之间的百分比差JavaScript

function calculatePercentageDifference(a, b) {
  var difference = a - b;
  var ratio = difference / b;
  var percentageDifference = ratio * 100;
  return percentageDifference;
}

var number1 = 10;
var number2 = 5;
var percentageDiff = calculatePercentageDifference(number1, number2);
console.log("百分比差值为：" + percentageDiff + "%");