js实现数字转汉字

function numberToChinese(num) {
    const digits = ['零', '一', '二', '三', '四', '五', '六', '七', '八', '九'];
    const units = ['', '十', '百', '千', '万', '十万', '百万', '千万', '亿'];
    let strNum = num.toString();
    let chineseStr = '';
    let length = strNum.length;
    let zeroFlag = false; // 标记是否需要插入“零”

    for (let i = 0; i < length; i++) {
        let digit = parseInt(strNum[i]);
        let position = length - i - 1; // 当前数字的位置
        let unit = units[position];

        if (digit === 0) {
            zeroFlag = true;
        } else {
            if (zeroFlag) {
                chineseStr += digits[0];
                zeroFlag = false;
            }
            chineseStr += digits[digit] + unit;
        }

        // 处理“一十”开头的情况
        if (position === 1 && digit === 1 && length > 2) {
            chineseStr = chineseStr.replace('一十', '十');
        }
    }

    // 处理末尾的“零”
    if (chineseStr.endsWith(digits[0])) {
        chineseStr = chineseStr.slice(0, -1);
    }

    return chineseStr;
}

// 示例
console.log(numberToChinese(123456789)); // 输出：一亿二千三百四十五万六千七百八十九
console.log(numberToChinese(1001)); // 输出：一千零一