在Js逆向的过程中经常遇到  window.btoa() /window.atob() :

   这是 浏览器内置的Base64 编码和解码 ，第十六题案例，第十九题案例  等等

解决方式 ：

1.   简单字符串使用 Buffer 方法

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  // atob base64 编码
  
  
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  var s = new Buffer.from("待解码的字符串", "base64").toString("binary")
  
  
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  // btoa base64 解码
  
  
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  var s = new Buffer.from("待编码的字符串", "binary").toString("base64")
  
  
  

2. python爬虫直接改写

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  import base64
  
  
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  # atob  base64编码
  
  
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  s = base64.b64encode("待解码的字符".encode("utf8")).decode()
  
  
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  # btoa  base64解码
  
  
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  s = base64.b64decode("待编码的字符".encode("utf8")).decode()
  
  
  

3. 直接用JS实现Base64功能

以下是 完整JS的base64代码

// 这是 完整可用的JS实现base64编码的模块

var Base64 = {

    // private property

    _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="

    // public method for encoding

    , encode: function (input)

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