查看源码之后

 带着script标签一同保存到本地里，保存为后缀名为html的文件，并把里面的eval改为alert,让他可以弹出来，打开文件

 啊哦，出来了，整理一下

function $(){var e=document.getElementById("c").value;if(e.length==16) if(e.match(/^be0f23/)!=null) if(e.match(/233ac/)!=null) if(e.match(/e98aa$/)!=null) if(e.match(/c7be9/)!=null){ var t=["fl","s_a","i","e}"]; var n=["a","_h0l","n"]; var r=["g{","e","_0"]; var i=["it‘","_","n"]; var s=[t,n,r,i]; for(var o=0;o<13;++o){ document.write(s[o%4][0]);s[o%4].splice(0,1) } } } document.write(‘<input id="c"><button onclick=$()>Ok</button>‘); delete 

不用根据这些个变量和document.write去算flag，拿到flag有两种方法：

1）满足正则

首先，满足length==16，正则的话^为开始符号，$为结尾符号，拼接一下：be0f233ac7be98aa，输入就拿到flag了。

2）将下面这段拿到控制台执行一下即可：

 var t=["fl","s_a","i","e}"]; var n=["a","_h0l","n"]; var r=["g{","e","_0"]; var i=["it‘","_","n"]; var s=[t,n,r,i]; for(var o=0;o<13;++o){ document.write(s[o%4][0]);s[o%4].splice(0,1) } }

flag{it‘s_a_h0le_in_0ne}