BT编程语言-文档

介绍
环境搭建
如何使用
代码示例
语法说明
输出
使用注释
声明变量
声明常量
数据类型
字符串模板
运算符
条件语句
Number数字操作
- len
- from_char
- to_number
- to_fixed
- to_string
- to_radix
- to_exponential
Str字符串操作
- len
- trim
- char
- char_code
- concat
- ends_with
- contain
- index
- last_index
- repeat
- replace
- search
- match
- slice
- split
- starts_with
- substr
- to_radix
- to_lowercase
- to_uppercase
- to_number
- to_string
- escape_html
- unescape_html
- parse
Array数组操作
- len
- to_string
- join
- each
- pop
- push
- shift
- unshift
- sort
- reverse
- slice
- splice
- concat
- contain
- index
- last_index
- find
- find_index
- find_last
- find_last_index
- every
- some
- filter
- map
- reduce
- reduce_right
- fill
- flat
- flat_map
- keys
- values
- entries
- clone
- delete
Object对象操作
- len
- to_string
- keys
- values
- reverse
- concat
- clone
- delete
- key_exists
- each
- map
fn函数
Regex正则表达式
- 语法
- 修饰符
- 字符类
- 元字符
- 重复匹配
- 空匹配
- 分组与标志
- ASCII 字符类
- Unicode支持
循环遍历
- For循环
- While 循环
- Loop 循环
关键字
- use
class类
date日期
fs文件操作
- get_path
- read
- write
- prepend
- append
- size
- rename
- copy
- delete
- create_dir
- create_file
- list
- is_dir
- is_file
- is_relative
- is_absolute
- is_symlink
- is_exists
- basename
- filename
- extension
系统函数
- bool
- eval
- exit
- include
- type
- call
- number
- string
- float
- int
- array
- object
- json
- regex
- radix
- parse_json
- parse_radix_int
- parse_radix_str
- char_code
- from_char
- is_empty
- is_null
- sleep
- rand
http库
- header
- status_code
- redirect
- url
- get
- post
- method
- server
- files
- cookie
- session
mysql库
- query
- bind
- all
- one
- exec
math库
- abs
- powf
- sqrt
- cbrt
- exp
- exp2
- expm1
- log10
- log2
- log1p
- sin
- cos
- tan
- asin
- acos
- atan
- atan2
- sinh
- cosh
- tanh
- asinh
- acosh
- atanh
- round
- ceil
- floor
- trunc
- min
- max
md5库
base64库
reqwest库
- method
- header
- cookie
- cookie_store
- body
- timeout
- query
- proxy
- redirect_policy
- send
process库
- arg
- args
- get_args
- env
- env_clear
- env_remove
- envs
- get_envs
- current_dir
- get_current_dir
- bind_stdio
- exit_status
- get_program
- status
- output
- stdin
- stdout
- child
- pid
- kill
- wait
- try_wait
- stdin_write
- stdout_read
- stdout_read_lines
- stderr_read
- stderr_read_lines
- inherit_stdio
- null_stdio
- child_running

BT编程语言文档

len

返回对象的长度

语法 Object.len()