js如何关闭当前页，而不弹出提示框

function closeWinAndOpen(url) {

  //利用随机数处理WinName

   var sWinName = "LR"+parseInt(Math.random() * 100000000);

    window.open(url,sWinName, ‘toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=no,resizable=yes,copyhistory=yes‘);
    closeWin();
}

function closeWin() {

    window.opener=null;

    window.open(‘‘,‘_self‘);

    window.close();

}