Tìm hiểu hàm lấy proxy, socks trình duyệt web

<script type="text/javascript">
function timsock(){
    var slist = window.document.f.socks.value;
    var kero = slist.match(/\d{1,3}([.])\d{1,3}([.])\d{1,3}([.])\d{1,3}((:)|(\s)+)\d{1,8}/g );
    if(kero){
        var list="";
        for(var i=0;i<kero.length;i++){
            if(kero[i].match(/\d{1,3}([.])\d{1,3}([.])\d{1,3}([.])\d{1,3}(\s)+\d{1,8}/g )){
                kero[i]=kero[i].replace(/(\s)+/,':');
            }
            list=list+kero[i]+"\n";
        }
        window.document.f.socks.value=list;
    }
    else{
        window.document.f.socks.value="";
    }
}
</script>