如何读取单选框里的值，当id都为="sex"时显示重复
前端

  <div class="layui-form-item" lay-filter="sex">
                <label class="layui-form-label">选择性别</label>
                <div class="layui-input-block" id="sex">
                    <input type="radio" name="sex"  value="男" title="男" checked>
                    <input type="radio" name="sex"  value="女" title="女">
                </div>
            </div>

JS
var gender=$('#sex input[name="sex"]:checked ').val()