layui单选框事件监听

<form class="layui-form dianxuan" action=""style="float: left;margin-top: 7px;margin-right: 20px;"><div class="layui-form-item"><label class="layui-form-label" style="width:100px"><b>显示型号</b></label><div class="layui-input-block"  id="IsPurchased"><input type="radio" name="sex" value="全部型号" title="全部型号" class="dan" lay-filter="erweima" checked><input type="radio" name="sex" value="活跃型号" title="活跃型号" class="dan"  lay-filter="erweima"></div></div>
</form>

layui.use('form', function() {var form = layui.form;form.on('checkbox(switchTest)', function(data) {alert("哈哈哈");layer.tips('开关checked：' + (this.checked ? 'true' : 'false'), data.othis);});form.on('radio(erweima)', function(data) {alert(data.value); //判断单选框的选中值//此处判断console.log(data.value)});form.on('submit(formDemo)', function(data) {alert("哈哈哈");return false;});form.render();
});