解密变量加密b

//&cls&cscript -nologo -e:jscript "%~f0" "%~1">"$解密.txt" & echo 解密完成！& choice /t 2 /d y /n & exit

var fso=new ActiveXObject('Scripting.FileSystemObject'),s='',key='',n=1;
var ws=new ActiveXObject('Wscript.Shell');
var f=fso.OpenTextFile(WSH.Arguments(0), 1);
while(!f.AtEndOfStream){
    var line=f.ReadLine();
    if(n<3){s+=line+'\r\n'}else s+=crack(line, key)+'\r\n';
    n++;
}
WSH.echo(s);

function crack(str, k){
    var m=str.match(/%[^%]+?:~-?\d*,1%/g);
    if(m){
        for(var i=0;i<m.length;i++){
            if(!key)var k=ws.ExpandEnvironmentStrings(m[i].replace(/:.+$/, '')+'%');
            var n=m[i].replace(/^%.+?:~(-?\d*).+$/, '$1');
            if(n=='')n=0;
            var str=str.replace(m[i], n=='-1'?k.slice(Number(n)):k.slice(Number(n), Number(n)+1));
        }
    }
    //var kw=str.match(/^@set '=\^">nul&.+?&@set '=([\x20-\x7e]{294})&@.+?&@echo "$/);
    var kw=str.match(/^@set '=\^">nul&.+?&@set '=(.+?)&@set.+?&@echo "$/);
    if(kw)key=kw[1].replace(/\^{3}/g, '^');
    return str
}