js 函数中的fmark参数是怎么计算出来的？求教

Question

estr:function(t){
    var i=s.default.enc.Utf8.parse(this.mmkey),
    e=s.default.enc.Utf8.parse("wfsdaff23sfsfs9e"),
    a=s.default.enc.Utf8.parse(t),
    n=s.default.AES.f(a,i,e,{mode:s.default.mode.CBC,padding:s.default.pad.Pkcs7});
    return n.toString()
},
hdDoCash:function(){
    var t=this,
    i=t.cashInput;
    var e=(new Date).getTime(),
    a=(0,o.default)(this.estr(this.ct+"&amount="+i+"&curtime="+e));
    this.request
    (
        "/app/cash/sec/apply","POST",
    {
        amount:i,curtime:e,fmark:a },
)}