全選插件

/*
    @see $("#checkall").controlCheckBox({chname:'checkProduct'});
    
*/
(function(jQuery){
    $.fn.controlCheckBox = function(options){
        var defaults = {
            chname: "checkname[]"
        };
        var options = $.extend(defaults, options);
        var $obj = $(this);
        $obj.click(function(){
            if (this.checked) {
                $("input[name='" + options.chname + "']").attr("checked", true);
            }
            else {
                $("input[name='" + options.chname + "']").removeAttr("checked");
            }
        });
        $("input[name='" + options.chname + "']").click(function(){
            if ($("input[name='" + options.chname + "']").filter(":checked").length == $("input[name='" + options.chname + "']").length) {
                $obj.attr("checked", true);
            }
            else {
                $obj.removeAttr("checked");
            }
        })
    }
})(jQuery);