js将数字转换成汉字

function numberToChinese(num) {
    const units = ['', '十', '百', '千', '万', '亿'];
    const nums = ['零', '一', '二', '三', '四', '五', '六', '七', '八', '九'];

    function partToChinese(part) {
        let result = '';
        let zeroFlag = false;
        for (let i = 0; i < part.length; i++) {
            const currentNum = parseInt(part[i]);
            const unit = part.length - i - 1;
            if (currentNum === 0) {
                zeroFlag = true;
            } else {
                if (zeroFlag) {
                    result += nums[0];
                    zeroFlag = false;
                }
                result += nums[currentNum] + units[unit % units.length];
            }
        }
        return result;
    }

    const numStr = num.toString();
    const parts = [];
    while (numStr.length > 0) {
        parts.unshift(numStr.slice(-4));
        numStr = numStr.slice(0, -4);
    }

    let finalResult = '';
    for (let i = 0; i < parts.length; i++) {
        const part = parts[i];
        const partChinese = partToChinese(part);
        if (partChinese !== '') {
            finalResult = partChinese + units[parts.length - i - 1] + finalResult;
        }
    }

    return finalResult;
}

// 示例使用
console.log(numberToChinese(123456789)); // 输出: 一亿二千三百四十五万六千七百八十九