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Format the value after rounding, with a kilobytes, rounded to kilobytes
<Html>
Javascript formatting numbers, thousands of characters, retaining decimals, rounding/*
Round the value and format it.
@ Param num value (Number or String)
@ Param cent: Number of decimal places to be retained)
@ Param isThousand whether the Sub-location is required: 0: not required, 1: required (value type );
@ Return: a string in the format of '20140901'
@ Type String
*/
Function formatNumber (num, cent, isThousand ){
Num = num. toString (). replace (/\ $ | \,/g ,'');
If (isNaN (num) // check that the input value is of the numerical type.
Num = "0 ";
If (isNaN (cent) // make sure that the input decimal point is a numeric value.
Cent = 0;
Cent = parseInt (cent );
Cent = Math. abs (cent); // obtain the number of decimal places and make sure it is a positive integer.
If (isNaN (isThousand) // make sure that the input must be of the numerical type in kilobytes.
IsThousand = 0;
IsThousand = parseInt (isThousand );
If (isThousand <0)
IsThousand = 0;
If (isThousand> = 1) // make sure that the input value is only 0 or 1
IsThousand = 1;
Sign = (num = Math. abs (num); // obtain the symbol (positive/negative)
// Math. floor: returns the maximum integer that is less than or equal to the value.
Num = Math. floor (num * Math. pow (10, cent) + 0.50000000001); // converts the specified decimal point to an integer first, and rounding out unnecessary decimal places.
Cents = num % Math. pow (10, cent); // obtain the decimal point.
Num = Math. floor (num/Math. pow (10, cent). toString (); // obtain the integer.
Cents = cents. toString (); // converts a decimal point to a string to evaluate the decimal point length.
While (cents. length <cent) {// complement the decimal point to the specified number of digits.
Cents = "0" + cents;
}
If (isThousand = 0) // you do not need a kilobytes of characters.
Return (sign )? '': '-') + Num + '.' + cents );
// Format the integer in kilobytes.
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 )? <G id = "1"> </G>
If x is a positive real number, the number of sub-places is rounded to five. What is the expression for retaining two decimal places?Select A because the sub-Location corresponds to 0.001. If the number in the sub-location is less than 0.005, then add 0.005 and multiply it by 100 to be less than 1, so that the int operation will discard it, that is, "four homes". If the number of sub-bits is greater than 0.005, add 0.005 and multiply it by 100 and greater than 1. In this way, the int operation will "Five in" The value of the sub-bits ", add 1 to the percentile.
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