number to chinese

number_cn.js

function number_cn(num, def) {
    def = def || 0;
    var output = [];
    var UNIT_STR = ['', '十', '百', '千', '万'];
    var NUMBER_STR = '零一二三四五六七八九十';

    num = Math.max(parseInt(num, 10) || def, def).toString().split('');

    while (num.length) {
        var val = parseInt(num.shift(), 10);
        output.push(NUMBER_STR.charAt(val) + (val === 0 ? '' : UNIT_STR[num.length]));
    }

    return output.join('').replace(/(?:^一(十)|(零)零+|零+$)/g, '$1');
}