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Miscellaneous functions

更新时间: 2026-04-12 01:29:34

This topic describes the syntax, features, parameters, and return values of miscellaneous functions. This topic also provides examples of these functions.

base64_enc | base64_dec | url_escape | url_unescape | randomseed | rand | rand_hit | crc | tonumber | base64_enc_safe | base64_dec_safe

base64_enc

Item	Description
Syntax	`base64_enc(s, [no_padding])`.
Description	Base64 encoding.
Parameters	s: The string to encode. no_padding (optional): Specifies whether to use padding. A value of `true` disables padding. The default value is `false`.
Return value	The Base64-encoded string.
Example	`if $http_data { decdata = base64_dec($http_data) say(concat('base64_decdata=', decdata)) say(concat('base64_encdata=', base64_enc('hello, dsl'))) }` Request header: `"data: aGVsbG8sIGRzbA=="` Response: `base64_decdata=hello, dsl base64_encdata=aGVsbG8sIGRzbA==`

base64_dec

Item	Description
Syntax	`base64_dec(s)`.
Description	Decodes a Base64-encoded string.
Parameters	s: The string to decode.
Return value	The decoded string.
Example	`if $http_data { decdata = base64_dec($http_data) say(concat('base64_decdata=', decdata)) say(concat('base64_encdata=', base64_enc('hello, dsl'))) }` Request header: `"data: aGVsbG8sIGRzbA=="` Response: `base64_decdata=hello, dsl base64_encdata=aGVsbG8sIGRzbA==`

url_escape

Item	Description
Syntax	`url_escape(s)`.
Description	URL encoding.
Parameters	s: The string to encode.
Return value	The URL-encoded string.
Example	`raw = '/abc/123/ dd/file.m3u8' esdata = url_escape(raw) dsdata = url_unescape(esdata) if eq(raw, dsdata) { say(concat('raw=', raw)) say(concat('esdata=', esdata)) say(concat('dsdata=', dsdata)) }` Outputs: `raw=/abc/123/ dd/file.m3u8 dsdata=%2Fabc%2F123%2F%20dd%2Ffile.m3u8 dsdata=/abc/123/ dd/file.m3u8`

url_unescape

Item	Description
Syntax	`url_unescape(s)` .
Description	Decodes a URL-encoded string.
Parameters	s: The string to decode.
Return value	Returns a URL-decoded string.
Example	`raw = '/abc/123/ dd/file.m3u8' esdata = url_escape(raw) dsdata = url_unescape(esdata) if eq(raw, dsdata) { say(concat('raw=', raw)) say(concat('esdata=', esdata)) say(concat('dsdata=', dsdata)) }` Outputs: `raw=/abc/123/ dd/file.m3u8 esdata=%2Fabc%2F123%2F%20dd%2Ffile.m3u8 dsdata=/abc/123/ dd/file.m3u8`

randomseed

Item	Description
Syntax	`randomseed()`.
Description	Specifies a seed for random number generation.
Parameters	None.
Return value	None.
Example	`randomseed() r = rand(1,100)`

rand

Item	Description
Syntax	`rand(n1, n2)`.
Description	Generates a random number. The number is between n1 and n2, inclusive.
Parameters	n1: The lower bound of the random number. n2: The upper bound of the random number.
Return value	This operation returns the generated random number.
Example	`r = rand(1,100)`

rand_hit

Item	Description
Syntax	`rand_hit(ratio)`.
Description	Returns true or false based on a specified probability.
Parameters	ratio: The probability of returning true. The value must be between 0 and 100.
Return value	Returns `true` with the probability specified by ratio. For example, if ratio is 100, the function returns `true`. If ratio is 0, the function returns `false`.
Example	`rand_hit(80)`

crc

Item	Description
Syntax	`crc(s)`.
Description	Calculates a Cyclic Redundancy Check (CRC) digest.
Parameters	s: The string for which to calculate the CRC digest.
Return value	The CRC digest of the string `s`.
Example	`crc('hello ascript')`

tonumber

Item	Description
Syntax	`tonumber(s, [base])`.
Description	Converts a string to a number.
Parameters	s: The string to convert. base (Optional): The target conversion base. Valid values: 10 and 16. The default is 10.
Example	`n = tonumber('100') say(concat('tonumber()=', n))` Output: `tonumber()=100`

base64_enc_safe

Item	Description
Syntax	`base64_enc_safe(str)`.
Description	Performs URL-safe Base64 encoding on a string. In the output, `+` is replaced with `-`, `/` is replaced with `_`, and any trailing `=` padding is removed.
Parameters	str: The string to encode.
Return value	Returns a string.
Example	`add_rsp_header('X-RESPOND-OUTPUT', concat('base64_enc_safe=', base64_enc_safe('hello, dsl')), true)` Response header: `X-RESPOND-OUTPUT: base64_enc_safe=aGVsbG8sIGRzbA`

base64_dec_safe

Item	Description
Syntax	`base64_dec_safe(str)`.
Description	Decodes a URL-safe Base64-encoded string. Before decoding, `-` is replaced with `+`, `_` is replaced with `/`, and the string is padded with `=` at the end to a multiple of 4 characters.
Parameters	str: The URL-safe Base64-encoded content.
Return value	Returns a string.
Example	`add_rsp_header('X-RESPOND-OUTPUT', concat('base64_dec_safe=', base64_dec_safe(base64_enc_safe('hello, dsl'))), true)` Response header: `X-RESPOND-OUTPUT:base64_dec_safe=hello, dsl`

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