攻防世界-web进阶-NaNNaNNaNNaN-Batman

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 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}

原文地址:https://www.cnblogs.com/tac2664/p/13866746.html