选择指定数量后checkbox不可选(变灰)javascript代码

　　选择3个后可以看到效果

<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%3E%20%0D%0A%0D%0Afunction%20disableCheckBox()%20%7B%20%0D%0Avar%20obj%3Ddocument.getElementsByTagName(%22input%22)%20%0D%0Afor(var%20i%3D0%3Bi%3Cobj.length%3Bi%2B%2B)%20%0D%0A%7B%20%0D%0Aif%20(%20!obj%5Bi%5D.checked%20)%20%0D%0Aobj%5Bi%5D.disabled%20%3D%20true%3B%20%0D%0A%7D%20%0D%0A%7D%20%0D%0Afunction%20ableCheckBox()%20%7B%20%0D%0Avar%20obj%3Ddocument.getElementsByTagName(%22input%22)%20%0D%0Afor(var%20i%3D0%3Bi%3Cobj.length%3Bi%2B%2B)%20%0D%0Aobj%5Bi%5D.disabled%20%3D%20false%3B%20%0D%0A%7D%20%0D%0A%0D%0Afunction%20check()%20%0D%0A%7B%20%0D%0Avar%20obj%3Ddocument.getElementsByTagName(%22input%22)%20%0D%0Avar%20sun%3D0%3B%20%0D%0A%0D%0Afor(var%20i%3D0%3Bi%3Cobj.length%3Bi%2B%2B)%20%0D%0A%7B%20%0D%0Aif(obj%5Bi%5D.type%3D%3D%22checkbox%22%20%26%26%20%0D%0Aobj%5Bi%5D.checked)%20%0D%0Asun%2B%2B%3B%20%0D%0A%0D%0Aif(%20sun%3C%203%20)%20%0D%0A%7B%20%0D%0AableCheckBox()%3B%20%0D%0A%2F%2Fbreak%3B%20%0D%0A%7D%20%0D%0Aelse%20if(sun%20%3D%3D%203%20)%20%0D%0A%7B%20%0D%0AdisableCheckBox()%3B%20%0D%0Aevent.srcElement.checked%3Dtrue%3B%20%0D%0Abreak%3B%20%0D%0A%7D%20%0D%0Aelse%20if(sun%20%3E%203%20)%20%0D%0A%7B%20%0D%0Aevent.srcElement.checked%3Dfalse%3B%20%0D%0Abreak%3B%20%0D%0A%7D%20%0D%0A%7D%20%0D%0A%7D%20%0D%0A%3C%2Fscript%3E"> 
<input type='checkbox' name='cate[]' 
value='102' onclick="check();">粤菜 <input 
type='checkbox' name='cate[]' value='103' 
onclick="check();">潮州 <input 
type='checkbox' name='cate[]' value='104' 
onclick="check();">客家 <input 
type='checkbox' name='cate[]' value='105' 
onclick="check();">川菜 <input 
type='checkbox' name='cate[]' value='106' 
onclick="check();">上海/江浙 <input 
type='checkbox' name='cate[]' value='107' 
onclick="check();">湖南 <input 
type='checkbox' name='cate[]' value='108' 
onclick="check();">湖北 <input 
type='checkbox' name='cate[]' value='109' 
onclick="check();">贵州 <input 
type='checkbox' name='cate[]' value='110' 
onclick="check();">东北 <input 
type='checkbox' name='cate[]' value='111' 
onclick="check();">江西 <input 
type='checkbox' name='cate[]' value='112' 
onclick="check();">北京 <input 
type='checkbox' name='cate[]' value='113' 
onclick="check();">鲁菜 <input 
type='checkbox' name='cate[]' value='114' 
onclick="check();">台湾 <input 
type='checkbox' name='cate[]' value='115' 
onclick="check();">新疆/清真 <input 
type='checkbox' name='cate[]' value='116' 
onclick="check();">云南 <input 
type='checkbox' name='cate[]' value='117' 
onclick="check();">其他中餐 <input 
type='checkbox' name='cate[]' value='118' 
onclick="check();">野味 <input 
type='checkbox' name='cate[]' value='119' 
onclick="check();">火锅 <input 
type='checkbox' name='cate[]' value='120' 
onclick="check();">海鲜 <input 
type='checkbox' name='cate[]' value='121' 
onclick="check();">比萨 <input 
type='checkbox' name='cate[]' value='122' 
onclick="check();">自助餐 <input 
type='checkbox' name='cate[]' value='123' 
onclick="check();">茶餐厅 <input 
type='checkbox' name='cate[]' value='124' 
onclick="check();">小吃面食 <input 
type='checkbox' name='cate[]' value='125' 
onclick="check();">烧烤 <input 
type='checkbox' name='cate[]' value='126' 
onclick="check();">素菜 <input 
type='checkbox' name='cate[]' value='127' 
onclick="check();">简餐 <input 
type='checkbox' name='cate[]' value='128' 
onclick="check();">快餐 <input 
type='checkbox' name='cate[]' value='129' 
onclick="check();">面包糕点 <input 
type='checkbox' name='cate[]' value='130' 
onclick="check();">甜品 <input 
type='checkbox' name='cate[]' value='131' 
onclick="check();">茶室 <input 
type='checkbox' name='cate[]' value='132' 
onclick="check();">咖啡厅 <input 
type='checkbox' name='cate[]' value='133' 
onclick="check();">酒吧 <input 
type='checkbox' name='cate[]' value='134' 
onclick="check();">日本 <input 
type='checkbox' name='cate[]' value='135' 
onclick="check();">韩国 <input 
type='checkbox' name='cate[]' value='136' 
onclick="check();">东南亚印 <input 
type='checkbox' name='cate[]' value='137' 
onclick="check();">法国 <input 
type='checkbox' name='cate[]' value='138' 
onclick="check();">意大利 <input 
type='checkbox' name='cate[]' value='139' 
onclick="check();">拉美 <input 
type='checkbox' name='cate[]' value='140' 
onclick="check();">无国界 <input 
type='checkbox' name='cate[]' value='141' 
onclick="check();">西餐 <input 
type='checkbox' name='cate[]' value='142' 
onclick="check();">其他西餐

　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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