$$("pay-style").find('input[type="radio"][name="payType"][value="3"]').find('.page-content').addClass('hide');
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="pay-style">
<input type="radio" name="payType" value="3">
</div>
</body>
<script src="http://code.jquery.com/jquery-2.1.1.min.js"></script>
<script>
var payType3 = $('input[name="payType"]');
console.log(payType3)
if(payType3.val()==3){
payType3.hide();
}
</script>
</html>
最好还是给他们加个id这样好获取。jq里hide()就能直接隐藏