JavaScript parsefloat Date Format instance

code is as follows

copy code

function Formatnum (prmnum,prmptn,prmnullvalue) { var nullvalue = Prmnullvalue? prmnullvalue:0; if (Prmnum = = "" | | Prmnum = = null) return nullvalue; Prmnum = Prmnum.replace (/,/g, ""); if (isNaN (prmnum)) return nullvalue; if (PRMPTN = = "" | | PRMPTN = = null) return prmnum; var ptnlen = prmptn.length; var pointindex = Prmptn.indexof ("."); var groupindex = Prmptn.indexof (","); var Pointlen = (PointIndex = = 1 0:ptnlen-pointindex-1); Prmnum = parsefloat (prmnum). tofixed (Pointlen) + ""; if (Groupindex!=-1) { if (PointIndex = = 1) pointindex = Ptnlen; var len = pointindex-groupindex-1; var reg = new RegExp ("(-?d+) (d{" +len+ "})"); while (Reg.test (prmnum)) Prmnum = Prmnum.replace (Reg, "$1,$2"); } return prmnum; }

Definitions and usage

The parsefloat () function parses a string and returns a floating-point number.

Grammar

Parsefloat (String)

Parameters	Description
X	Necessary. The string to be parsed.

return value

Returns the parsed number.

Tips and comments

Note: only the first digit in the string is returned.

Note: the spaces at the beginning and end are allowed.

Tip: If the first character of a string cannot be converted to a number, then parsefloat () returns Nan.

Tip: If you want to resolve only the integer portion of a number, use the parseint () method.

Instance

In this case, we'll use parsefloat () to parse the different strings:

<script type= "text/web Effects" >

document.write (parsefloat ("ten")) 
document.write (parsefloat ("10.00")) 
document.write (parsefloat ("10.33")) 
document.write (parsefloat ("a") 
document.write ( Parsefloat ("a")) 
document.write (parsefloat ("Years"))
document.write (parsefloat ("he"))

< /script>

Output:

10.33
nan