JS format amount optional with _javascript and retention accuracy skill

JS format amount, optional whether with thousand points, optional retention accuracy, but also found on the Internet, but the use of no problem

Copy Code code as follows:

/*
The values are rounded and formatted.
@param num Value (number or string)
@param number of decimal places to keep cent
@param whether the Isthousand need to be 0: not required, 1: required (numerical type);
A string @return format, such as ' 1,234,567.45 '
@type String
*/
function FormatNumber (Num,cent,isthousand) {
num = num.tostring (). Replace (/\$|\,/g, "");
if (isNaN (num))//check that the incoming value is a numeric type.
num = "0";
if (isNaN (cent))//ensures that incoming decimal places are numeric values.
cent = 0;
cent = parseint (cent);
cent = math.abs (cent);//Find the number of decimal places to ensure a positive integer.
if (isNaN (Isthousand))//ensures that the thousand-bit value type is required for incoming.
Isthousand = 0;
Isthousand = parseint (Isthousand);
if (Isthousand < 0)
Isthousand = 0;
if (Isthousand >=1)//Ensure that the number passed in is only 0 or 1
Isthousand = 1;
Sign = (num = (num = math.abs (num));/get symbol (positive/negative)
Math.floor: Returns the largest integer less than or equal to its numeric argument
num = Math.floor (Num*math.pow (10,cent) +0.50000000001);//converts the specified decimal places to integers. Extra decimal places rounded.
cents = Num%math.pow (10,cent); Find the decimal digit value.
num = Math.floor (Num/math.pow (10,cent)). toString ();//Find an integer digit value.
cents = cents.tostring ();//converts decimal places to strings to find decimal lengths.
while (cents.length<cent) {//complements the decimal places to the specified number of digits.
cents = "0" + cents;
}
if (Isthousand = = 0)//no thousand characters are required.
Return (((sign)? ': '-') + num + '. ' + cents);
The integer portion is formatted as a decimal point.
for (var i = 0; I < Math.floor ((num.length-(1+i))/3); i++)
num = num.substring (0,num.length-(4*i+3)) + ', ' +
Num.substring (num.length-(4*i+3));
Return (((sign)? ': '-') + num + '. ' + cents);
}