/**
 * 获取checkBox复选框选中的选项
 *
 * @param 
 * @arrange (512.笔记) jb51.cc
 **/
var form = document.getElementById("form2");

var field = form.elements["test2"];
var option = Dining.getSelectedOption(form,field);
var message = "";
for (var i = 0,len = option.length; i < len; i++) {
message += "Select id:" + option[i].id + "\nSelected name:" + option[i].name + "\nSelected value:" + option[i].value + "\n\n";
}
alert(message);
/*获取选中的选项*/
getSelectedOption: function (selectform,selectionfield) {
var result = [];
var option = null;
for (var i = 0; i < selectionfield.length; i++) {
option = selectionfield[i];
if (option.checked) {
result.push(option);
}
}
return result;
}

<form id='form2'>
<label>排序：</label><input id='aaaaa' type='checkBox' name='test2' value='1'>
<label for='aaaaa'>月销量</label><input id='bbbbb' type='checkBox' name='test2' value='2'>
<label for='bbbbb'>评分</label><input id='ccccc' type='checkBox' name='test2' value='3'>
<label for='ccccc'>优惠</label> <br style='clear:both'><label>分类：</label><input id='ddddd' type='checkBox' name='test2' value='4'>
<label for='ddddd'>商务套餐</label><input id='eeeee' type='checkBox' name='test2' value='5'>
<label for='eeeee'>凉菜</label><input id='fffff' type='checkBox' name='test2' value='6'>
</form>