jquery 全选 反选

$(function(){
        $('#inputChkAll').click(function(){
                $("input[name='chkJob']").attr("checked", $(this).attr("checked"));//注意此处
        });
});

//全选
function checkall() {
        var all = document.getElementsByTagName("input");
        for (var i = 0; i < all.length; i++) {
                if (all[i].type == "checkbox") {
                        all[i].checked = true;
                }
        }
}
 
// 反选
function checknull() {
        var all = document.getElementsByTagName("input");
        for (var i = 0; i < all.length; i++) {
                if (all[i].type == "checkbox") {
                        all[i].checked = false;
                }
        }
}

ref

http://www.imwls.com/jquery-checkbox-checkall-checknone