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<body onload="init()">
<div class="ppt">
<div id="div1" class="all">
<div class="pic">
<p>This is the first question description.</p>
<div id='1' class="text">
<input id='a' type="radio" name="radio" class="o"/><span class="f">A.one11</span><br>
<input id='b' type="radio" name="radio" class="o"/><span class="f">B.two</span><br>
<input id='c' type="radio" name="radio" class="o"/><span class="t">C.three</span><br>
<input id='d' type="radio" name="radio" class="o"/><span class="f">D.four</span><br>
</div>
<div id='1' class="anwser">正确答案是:C</div>
</div>
<div class="pic">
<p>This is the first question description.</p>
<div id='2' class="text">
<input id='a' type="radio" name="radios" class="t"/><span class="to">A.one22</span><br>
<input id='b' type="radio" name="radios" class="t"/><span class="fo">B.two</span><br>
<input id='c' type="radio" name="radios" class="t"/><span class="fo">C.three</span><br>
<input id='d' type="radio" name="radios" class="t"/><span class="fo">D.four</span><br>
</div>
<div id="2" class="anwser">正确答案是:A</div>
</div>
<div class="pic">
<p>This is the first question description.</p>
<div id='3' class="text">
<input id='a' type="radio" name="radiot" class="s"/><span class="ts">A.one33</span><br>
<input id='b' type="radio" name="radiot" class="s"/><span class="fs">B.two</span><br>
<input id='c' type="radio" name="radiot" class="s"/><span class="fs">C.three</span><br>
<input id='d' type="radio" name="radiot" class="s"/><span class="fs">D.four</span><br>
</div>
<div id="3" class="anwser">正确答案是:A</div>
</div>
</div>
<!-- <div class="l lrpub">l</div>-->
<div class="r lrpub">下一题</div>
</div>
</body>
var k = 0;
$(".r").click(function() {
if (k < $(".pic").length-1 && $("input").is(':checked')) {
k++;
} else if($(("input").length-1).prop("checked", false)){
alert("不能为空")
}
else if(k<$(".pic").length-1){
alert("到底啦");
}else{
alert("请答题")
}
$(".pic").eq(k).show().siblings(".pic").hide();
});
$(function(){
$(".pic:not(:eq(0))").hide();
});
var k=0;
$(".r").click(function() {
if (k < $(".pic").length) {
if($(".pic:eq("+k+") input").is(':checked')){
k++;
$(".pic").eq(k).show().siblings(".pic").hide();
}else{
alert("请答题");
}
}else{
alert("到底啦");
}
});