VBScript-to-JavaScript Functions （转）

FormatNumber(Expression, NumDigitsAfterDecimal, IncludeLeadingDigit,
        UseParensForNegativeNumbers, GroupDigits)
======================================================================
function FormatNumber(num,decimalNum,bolLeadingZero,bolParens,bolCommas)
/**********************************************************************
    IN:
        NUM - the number to format
        decimalNum - the number of decimal places to format the number to
        bolLeadingZero - true / false - display a leading zero for
                    numbers between -1 and 1
        bolParens - true / false - use parenthesis around negative numbers
        bolCommas - put commas as number separators.

    RETVAL:
        The formatted number!
**********************************************************************/
{
        if (isNaN(parseInt(num))) return "NaN";
    var tmpNum = num;
    var iSign = num < 0 ? -1 : 1;        // Get sign of number
    
    // Adjust number so only the specified number of numbers after
    // the decimal point are shown.
    tmpNum *= Math.pow(10,decimalNum);
    tmpNum = Math.round(Math.abs(tmpNum))
    tmpNum /= Math.pow(10,decimalNum);
    tmpNum *= iSign;          // Readjust for sign