layui radio点击事件实现input显示和隐藏的教程

<link rel="stylesheet" href="/static/index/layui/css/layui.css" rel="external nofollow" >
<script type="text/javascript" src="/static/index/layui/layui.js" charset="utf-8"></script>
<script type="text/javascript" src="/static/index/js/jquery-3.3.1.min.js" charset="utf-8"></script>
<form class="layui-form" action="">
 <div class="layui-form-item">
  <label class="layui-form-label" style="width:100px">是否已购买：</label>
  <div class="layui-input-block" id="IsPurchased" >
   <input type="radio" name="t" value="购买" title="购买" lay-filter="aaa"/>
   <input type="radio" name="t" value="试用" title="试用" lay-filter="aaa"/>
  </div>
 </div>
 <div class="layui-form-item count">
  <label class="layui-form-label">试用次数：</label>
  <div class="layui-input-inline">
   <input type="text" id="ProbationAccount" required="required" placeholder="请输入试用次数" autocomplete="off" class="layui-input" />
  </div>
  <div class="layui-form-mid layui-word-aux"></div>
 </div>
  
</form>
 <script>
  
  layui.use('form', function () {
   var form = layui.form;
  
   form.on('radio(aaa)', function (data) {
  
    if ($('#IsPurchased input[name="t"]:checked ').val() == "购买") {
     $(".count").hide();
    }
    else {
     $(".count").show();
    }
    form.render();
   });
  });
  
  
 </script>