In JavaScript, you can use the parseInt() function to convert an octal number to a decimal number. This function is used to parse strings. The returned result is the parsed integer. When the parameter is set to 8 , you can convert octal to decimal, the syntax is "parseInt(string,8)".
The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.
The parseInt() function can parse a string and return an integer.
When the value of parameter radix is 0, or the parameter is not set, parseInt() will determine the base of the number based on string.
When the parameter radix is omitted, JavaScript defaults to the radix of numbers as follows:
If string starts with "0x", parseInt() will parse the rest of string into hexadecimal integers.
If string starts with 0, then ECMAScript v3 allows an implementation of parseInt() to parse the following characters into octal or hexadecimal numbers.
If string starts with a number from 1 to 9, parseInt() will parse it into a decimal integer.
parseInt(string, radix)
string Required. The string to be parsed.
radix Optional. Represents the base of the number to be parsed. The value is between 2 ~ 36.
The example is as follows:
<html>
<head>
<meta charset="utf-8">
<title>123</title>
</head>
<body>
<script>
document.write(parseInt("12",8)) ;
</script>
</body>
</html>Output result:
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