checkbox全選優(yōu)秀代碼

    <script language=javascript>
    function selectall() //全選
    {
    var arrobj = document.all;
    for(var i = 0; i < arrobj.length;i++)
    {
    if(typeof arrobj[i].type != undefined && arrobj[i].type=='checkbox') arrobj[i].checked =true;
    }
    }
    function unselectall() //全不選
    {
    var arrobj = document.all;
    for(var i = 0; i < arrobj.length;i++)
    {
    if(typeof arrobj[i].type != undefined && arrobj[i].type=='checkbox') arrobj[i].checked =false;
    }
    }
    </script>