js float转换成百分比

function floatToPercentage(floatNum) {
    // 将浮点数乘以100
    let percentage = floatNum * 100;
    
    // 格式化为两位小数的百分比字符串
    return percentage.toFixed(2) + '%';
}

// 使用示例
let num = 0.75;
console.log(floatToPercentage(num)); // 输出: "75.00%"

const Decimal = require('decimal.js');

function floatToPercentagePrecise(floatNum) {
    let decimalNum = new Decimal(floatNum);
    let percentage = decimalNum.times(100).toFixed(2);
    return percentage + '%';
}

console.log(floatToPercentagePrecise(0.1 + 0.2)); // 输出: "30.00%"

function floatToPercentageWithSign(floatNum) {
    let percentage = floatNum * 100;
    if (floatNum < 0) {
        return '(' + Math.abs(percentage).toFixed(2) + '%)';
    } else {
        return percentage.toFixed(2) + '%';
    }
}

console.log(floatToPercentageWithSign(-0.25)); // 输出: "(25.00%)"