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<div class="cls2" style="display=none;">
<div class="dvbox" data="1"></div>
</div>
<div class="cls2" style="display=block;">
<div class="dvbox" data="2"></div>
</div>
<!DOCTYPE html>
<html>
<head>
<script src="/jquery/jquery-1.11.1.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
var s=$(".cls2:visible>.dvbox").attr("data");
alert(s);
});
});
</script>
</head>
<body>
<button>选择器</button>
<div class="cls2" style="display:none;">
<div class="dvbox" data="1">11111</div>
</div>
<div class="cls2" style="display:block;">
<div class="dvbox" data="2">22222</div>
</div>
</body>
</html>
$(".cls2:visible>.dvbox:visible").attr("data");