为什么atob()不是btoa()

javascript里面

使用atob()函数完成base-64 decode

使用btoa()函数完成base-64 encode

命名的原因，找到一个解释

In these APIs, for mnemonic purposes, the "b" can be considered to stand for "binary", and the "a" for "ASCII".

In practice, though, for primarily historical reasons, both the input and output of these functions are Unicode strings.