layui 验证 判断值只能中文(姓名、用户名)

username" value="{$rsu['real_name']}" placeholder="真实姓名" autocomplete="off" class="layui-input">

<script>
layui.use(['form','jquery','layer'], function(){
      var layer = layui.layer
      ,form = layui.form
      ,$= layui.$;
      
      
    form.verify({
      username: function(value, item){ //value：表单的值、item：表单的DOM对象
        if(!new RegExp("^[\u4e00-\u9fa5\]+$").test(value)){
          return '姓名只能是中文';
        }

      }
    });

      
      
});
</script>