js非空判断问题100分，在线等
<div class="answer">
<ul id="ul1">
<span>答案：</span>
<input name="radio" type="radio" value="" id="1" onclick="radio_click('ul1',1)"
class="nav_1" />
<label class="btn_1" value="" onclick="lable_click('ul1',1,1)">
</label>
<input name="radio" type="radio" value="" id="2" onclick="radio_click('ul1',2)"
class="nav_1" />
<label class="btn_2" value="" onclick="lable_click('ul1',2,2)">
</label>
<input name="radio" type="radio" value="" id="3" onclick="radio_click('ul1',3)"
class="nav_1" />
<label class="btn_3" value="" onclick="lable_click('ul1',3,3)">
</label>
<input name="radio" type="radio" value="" id="4" onclick="radio_click('ul1',4)"
class="nav_1" />
<label class="btn_4" value="" onclick="lable_click('ul1',4,4)">
</label>
</ul>
</div>
</head>
<script type="text/javascript" src="jquery-1.6.2.js"></script>
<body>
<input type="radio" name="one" value="1.1" checked="checked" />答案1
<input type="radio" name="one" value="2.2" />答案2
<input type="radio" name="one" value="3.3" />答案3
<input type="radio" name="one" value="4.4" />答案4
<button onclick="lable_click()">总分数</button>
</body>
<script type="text/javascript">
var num=0;
function lable_click(){
var a=$("input[name='one'][checked]").val();
if("1.1"==a){
num=2;
}else{
num=0;
}
alert('总分数是:'+num)
}
</script>
if($("[name='radio']:checked").length > 0){
alert("选了答案");
}else{
alert("1个都没选");
}
