js 数字转百分数

function numberToPercentage(number, decimalPlaces = 2) {
  // 将数字乘以100
  let percentage = number * 100;
  
  // 四舍五入到指定的小数位数
  percentage = parseFloat(percentage.toFixed(decimalPlaces));
  
  // 返回带有百分号的字符串
  return `${percentage}%`;
}

// 使用示例
console.log(numberToPercentage(0.1234)); // 输出 "12.34%"
console.log(numberToPercentage(0.5));    // 输出 "50.00%"
console.log(numberToPercentage(1.2345, 1)); // 输出 "123.5%"

// 使用decimal.js处理高精度计算
const Decimal = require('decimal.js');

function preciseNumberToPercentage(number, decimalPlaces = 2) {
  const percentage = new Decimal(number).mul(100).toFixed(decimalPlaces);
  return `${percentage}%`;
}

console.log(preciseNumberToPercentage(0.1)); // 输出 "10.00%"