JS数字金额大写转换

exchange.js

var digitUppercase = function(n) {
    var fraction = ['角', '分'];
    var digit = [
        '零', '壹', '贰', '叁', '肆',
        '伍', '陆', '柒', '捌', '玖'
    ];
    var unit = [
        ['元', '万', '亿'],
        ['', '拾', '佰', '仟']
    ];
    var head = n < 0 ? '欠' : '';
    n = Math.abs(n);
    var s = '';
    for (var i = 0; i < fraction.length; i++) {
        s += (digit[Math.floor(shiftRight(n,1+i)) % 10] + fraction[i]).replace(/零./, '');
    }
    s = s || '整';
    n = Math.floor(n);
    for (var i = 0; i < unit[0].length && n > 0; i++) {
        var p = '';
        for (var j = 0; j < unit[1].length && n > 0; j++) {
            p = digit[n % 10] + unit[1][j] + p;
            n = Math.floor(shiftLeft(n, 1));
        }
        s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
    }
    return head + s.replace(/(零.)*零元/, '元')
        .replace(/(零.)+/g, '零')
        .replace(/^整$/, '零元整');
};
 
console.log(digitUppercase(100111));
console.log(digitUppercase(7.52));  
console.log(digitUppercase(951434677682.00));

// 向右移位
function shiftRight(number, digit){
    digit = parseInt(digit, 10);
    var value = number.toString().split('e');
    return +(value[0] + 'e' + (value[1] ? (+value[1] + digit) : digit))
}
// 向左移位
function shiftLeft(number, digit){
    digit = parseInt(digit, 10);
    var value = number.toString().split('e');
    return +(value[0] + 'e' + (value[1] ? (+value[1] - digit) : -digit))
}