translate salary

cal.js

// http://40era.com/2641/
var calTW = function(salary, mo) {
    var range = {
            r1: {
                off: 0,
                tax: 3,
                range: 1500
            },
            r2: {
                off: 105,
                tax: 10,
                range: 4500
            },
            r3: {
                off: 555,
                tax: 20,
                range: 9000
            },
            r4: {
                off: 1005,
                tax: 25,
                range: 35000
            },
            r5: {
                off: 2755,
                tax: 30,
                range: 55000
            },
            r6: {
                off: 5505,
                tax: 35,
                range: 80000
            },
            r7: {
                off: 13505,
                tax: 45,
                range: 80001
            }
        },
        basic = 4800,
        _off = 0,
        _tax = 0,
        _taxTotal = 0,
        _realGet = 0,
        _mo = mo || 12;

    if(salary < range.r1.range) {
        _off = range.r1.off;
        _tax = range.r1.tax;
    }else if(salary < range.r2.range) {
        _off = range.r2.off;
        _tax = range.r2.tax;
    }else if(salary < range.r3.range) {
        _off = range.r3.off;
        _tax = range.r3.tax;
    }else if(salary < range.r4.range) {
        _off = range.r4.off;
        _tax = range.r4.tax;
    }else if(salary < range.r5.range) {
        _off = range.r5.off;
        _tax = range.r5.tax;
    }else if(salary < range.r6.range){
        _off = range.r6.off;
        _tax = range.r6.tax;
    }else{
        _off = range.r7.off;
        _tax = range.r7.tax;
    }

    _taxTotal = (( salary - basic ) * (_tax / 100) ) - _off;
    _realGet = salary - _taxTotal;

    // console.log('TAX(mo) RMB = ', _taxTotal, ' | NTD = ', _taxTotal * 5);
    // console.log('REAL(mo) RMB = ', _realGet, ' | NTD = ', _realGet * 5);
    // console.log('REAL(year=', _mo, ') RMB = ', _realGet * _mo, ' | NTD = ', _realGet * 5 * _mo);

    return {
        RMB: {
            taxMonth: _taxTotal / _mo,
            taxYear: _taxTotal,
            realMonth: _realGet,
            realYear: _realGet * _mo,
            salaryMonth: salary,
            salaryYear: salary * _mo,
            taxRate: _tax + '%',
            taxOff: _off
        },
        NTD: {
            taxMonth: (_taxTotal * 5) / _mo,
            taxYear: _taxTotal * 5,
            realMonth: _realGet * 5,
            realYear: _realGet * 5 * _mo,
            salaryMonth: salary * 5,
            salaryYear: salary * 5 * _mo,
            taxRate: _tax + '%',
            taxOff: _off * 5
        }
    };
};