In the JS to convert the character to the number of parseint () parsefloat () () Three functions, let us explain their syntax and use methods.
About the number function
The number object is the wrapper object for the original numeric value.
To create the syntax for a number object:
var mynum=new number (value);
var mynum=number (value);
The parameter value is the number of the number object that you want to create, or the value you want to convert to numbers.
return value
When number () and operator new are used together as constructors, it returns a newly created number object. If you do not use the new operator to call number () as a function, it converts its arguments to an original numeric value and returns this (Nan) if the conversion fails.
Instance
var big = Number.MAX_VALUE
Alert (number (' 9999999.9999999 ')
Result 9999999.9999999
Alert (number (' 99999999.99999999 ')
Result 99999999.99999998
Alert (number (' 99999999.999999999 ')
Result 100000000
parseint Introduction
The parseint () function parses a string and returns an integer.
Syntax
parseint (string, radix)
When the value of the parameter radix is 0, or if the parameter is not set, parseint () determines the cardinality of the number based on a string.
Note: Only the first digit in the string is returned.
Note: The opening and trailing spaces are allowed.
Tip: If the first character of a string cannot be converted to a number, then parsefloat () returns Nan.
Instance
parseint ("10"); Return 10
parseint ("19", 10); return 19 (10+9)
parseint ("11", 2); Return 3 (10+9)
parseint ("17", 8); Return 15 (8+7)
parseint ("1f", 16); Return 31 (16+15)
parseint ("010"); Undecided: return 10 or 8
Example Two
Parsefloat ("1234blue"); Returns 1234.0
Parsefloat ("0xa"); Returns Nan
Parsefloat ("22.5"); Returns 22.5
Parsefloat ("22.34.5"); Returns 22.34
Parsefloat ("0908"); Returns 908
Parsefloat ("Blue"); Returns Nan
parsefloat function
The parsefloat () function parses a string and returns a floating-point number.
Syntax
Parsefloat (String) parameter description
X required. 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 opening and trailing spaces 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
document.write (parsefloat ("10"))
document.write (parsefloat ("10.00"))
document.write (parsefloat ("10.33"))
10
10
10.33
<html>
<head>
<!--
<script type= "text/web Effects" src= "Parseint.js" ></script
<script type= "Text/javascript"
<!--
function result (str)
{
document.write (str) (parseint);
}
</script>
<title></title>
</head>
<body>
parseint ("0") =<script type= "Text/javascript" >result ("0") </script><br></br>
parseint ("a") =< Script type= "Text/javascript" >result ("a") </script><br></br>
parseint ("1") =<script Type= "Text/javascript" >result ("1") </script><br></br>
parseint ("") =<script type= " Text/javascript ">result (") </script><br></br>
parseint ("7") =<script type= "text/ JavaScript ">result (" 7 ") </script><br></br>
parseint (" modified ") =<script type=" text/ JavaScript ">result" ("Modified") </SCRIPT><BR></BR>
parseint ("8") =<script type= "Text/javascript" >result ("8") </script><br></br>
parseint ("") =<script type= "Text/javascript" >result ("") </script><br></br>
parseint ("9") =<script type= "Text/javascript" >result ("9") </script><br></br>
parseint ( "a") =<script type= "Text/javascript" >result ("a") </script><br></br>
parseint ("10") = <script type= "Text/javascript" >result ("ten") </script><br></br>
</body>
</ Html>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
