for(i=0;i<frm_employee.elements.length;i++)
if(frm_employee.elements[i].type=="checkbox"&&frm_employee.elements[i].check==1)
break;
if(i==frm_employee.elements)
alert("please choose 1 checkbox at least")
if(frm_employee.elements[i].type=="checkbox"&&frm_employee.elements[i].check==1)
break;
if(i==frm_employee.elements)
alert("please choose 1 checkbox at least")
function test_cb_checked()
{
var cb_checked=0;
for (var i=0;i<this.forms.length;i++)
{
var form_obj =this.forms[i];
for (var j=0;i<form_obj.elements.length;j++)
{var elements_obj=form_obj.elements[j];
if (elements_obj.type=="checkbox")
{if (elements_obj.checked)
{ cb_checked++;
}
}
}}
if (cb_checked)//判断的选择数,一项或者多项
{……}//处理判断结果}
随便写的没测试过,仅共参考!!!!!!!!!!!!!!