金額常用函數

// 金額數字逗號隔開函數

function numFormat (num) {
    return (num.toFixed(2) + '').replace(/\d{1,3}(?=(\d{3})+(\.\d*)?$)/g, '$&,')
}

// 金額轉大寫

digitUppercase(price) {
    const fraction = ['角', '分'];
    const digit = ['零', '壹', '貳', '叄', '肆', '伍', '陸', '柒', '捌', '玖'];
    const unit = [
        ['元', '萬', '億'],
        ['', '拾', '佰', '仟'],
    ];
    let num = Math.abs(price);
    let s = '';
    fraction.forEach((item, index) => {
        s += (digit[Math.floor(num * 10 * (10 ** index)) % 10] + item).replace(/零./, '');
    });
    s = s || '整';
    num = Math.floor(num);
    for (let i = 0; i < unit[0].length && num > 0; i += 1) {
        let p = '';
        for (let j = 0; j < unit[1].length && num > 0; j += 1) {
        p = digit[num % 10] + unit[1][j] + p;
        num = Math.floor(num / 10);
        }
        s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
    }
    return s.replace(/(零.)*零元/, '元').replace(/(零.)+/g, '零').replace(/^整$/, '零元整');
}