js转换人民币金额 小写到大写

u.bigNum=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(n * 10 * Math.pow(10, 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(n / 10);    
                            }    
                            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$/, '零元整');    
                    } 
//***************
    window.$core = u

来自：房屋管理