simple_js

这题考察js代码

function dechiffre(pass_enc){
        var pass = "70,65,85,88,32,80,65,83,83,87,79,82,68,32,72,65,72,65";
        var tab  = pass_enc.split(',');
                var tab2 = pass.split(',');var i,j,k,l=0,m,n,o,p = "";i = 0;j = tab.length;
                        k = j + (l) + (n=0);
                        n = tab2.length;
                        for(i = (o=0); i < (k = j = n); i++ ){o = tab[i-l];p += String.fromCharCode((o = tab2[i]));
                                if(i == 5)break;}
                        for(i = (o=0); i < (k = j = n); i++ ){
                        o = tab[i-l];
                                if(i > 5 && i < k-1)
                                        p += String.fromCharCode((o = tab2[i]));
                        }
        p += String.fromCharCode(tab2[17]);
        pass = p;return pass;
    }
    String["fromCharCode"](dechiffre("\x35\x35\x2c\x35\x36\x2c\x35\x34\x2c\x37\x39\x2c\x31\x31\x35\x2c\x36\x39\x2c\x31\x31\x34\x2c\x31\x31\x36\x2c\x31\x30\x37\x2c\x34\x39\x2c\x35\x30"));
    h = window.prompt('Enter password');
    alert( dechiffre(h) );

乍一看很多，但实际上都是些没用的变量，经过简化后的代码：

function dechiffre(pass_enc) {
    var pass = "70,65,85,88,32,80,65,83,83,87,79,82,68,32,72,65,72,65";
    var tab = pass_enc.split(',');
    var tab2 = pass.split(',');
    var i, p = "";
    for (i = 0; i < tab2.length; i++) {
        p += String.fromCharCode(tab2[i]);
        if (i == 5) 
            break;
    }
    for (i = 0; i < tab2.length; i++) {
        if (i > 5 && i < tab.length - 1) 
            p += String.fromCharCode(tab2[i]);
    }
    p += String.fromCharCode(tab2[17]);
    pass = p;
    return pass;
}
String["fromCharCode"](dechiffre("\x35\x35\x2c\x35\x36\x2c\x35\x34\x2c\x37\x39\x2c\x31\x31\x35\x2c\x36\x39\x2c\x31\x31\x34\x2c\x31\x31\x36\x2c\x31\x30\x37\x2c\x34\x39\x2c\x35\x30"));

就不管代码是什么了，直接看pass的内容，写段代码转一下：

let pass=[70,65,85,88,32,80,65,83,83,87,79,82,68,32,72,65,72,65]
let code=pass.map((e)=>{
  return String.fromCharCode(e)
})
console.log(code.toString())

但是解出来发现是加密码
那么就去解下面那个
依旧使用上面的代码，不过数组内容换一下

let pass=[55,56,54,79,115,69,114,116,107,49,50]
let code=pass.map((e)=>{
  return String.fromCharCode(e)
})
console.log(code.toString())

得到正确密码，再加上格式cyberspace{}，提交即可