其实之前做题的时候有遇到过，但是不懂，这次又遇到了呢，有了些理解，bugku真的太适合新手了叭

JSFUCK编码

格式：由()+[]!6个字符组成

在黑客行为中，你的js代码可能被关键词检测，于是考虑躲避关键词检测的想法，例如 eval等关键词。（用上述6个字符替代关键词等）
用途：

1. 脚本注入时防止过滤
2. 一定程度加密关键代码（生成代码很长，不适合加密大量代码。只能一定程度上加密，不能依赖）
   
   例题：
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   放到控制台运行，会有弹框hello
   
   源码：alert("hello")
   
   参考网站：https://www.cnblogs.com/chianquan/p/5671474.html