layui checkbox 复选框第一次点击没反应 第一次点击不生效，怎么解决，手动渲染一次from解决。form.render();
解决办法：再次渲染checkbox，form.render();

代码是thinkphp5.1

<div class="weadmin-body">
    <form id="form1" class="layui-form">
        <div class="layui-form-item">
            <label class="layui-form-label">用户名</label>
            <div class="layui-input-block">
                <input type="text" autocomplete="off" class="layui-input " value="{{$user.username}}" disabled>
            </div>
        </div>
        <div class="layui-form-item" pane="">
            <label class="layui-form-label">授权角色</label>
            <div class="layui-input-block">
                <volist name="groups" id="vo" >
                    <input type="checkbox" name="groups[]" {{$vo.checked}} value="{{$vo.id}}" lay-skin="primary" title="{{$vo.title}}">
                </volist>
            </div>
        </div>
        <div class="layui-form-item">
            <div class="layui-input-block">
                <button class="layui-btn" lay-submit="" lay-filter="add">立即提交</button>
                <button type="reset" class="layui-btn layui-btn-primary">重置</button>
            </div>
        </div>
    </form>
</div>

<script type="text/javascript">
    layui.extend({
        admin: '{/}../../static/js/admin'
    });
    layui.use(['admin', 'jquery', 'form', 'layer', 'tree', 'util', 'element',], function () {
        var admin = layui.admin,
            $ = layui.jquery,
            form = layui.form,
            layer = layui.layer;
        //监听提交
        form.render();
        form.on('submit(add)', function (data) {
            let send_json = data.field;
            $.ajax({
                url: '/admin/user/authUser',
                method: 'post',
                data: send_json,
                dataType: 'JSON',
                success: function (res) {
                    if (res.code == 0) {
                        layer.alert("授权成功成功", {
                            icon: 6
                        }, function () {
                            // 获得frame索引
                            var index = parent.layer.getFrameIndex(window.name);
                            //关闭当前frame
                            parent.layer.close(index);
                        });
                    } else {
                        layer.msg(res.msg, {icon: 5});
                    }
                },
                error: function (data) {
                    layer.msg('服务器繁忙', {icon: 5});
                }
            });
            return false;
        });

        //遍历select option
        $(document).ready(function () {

        });
    });
</script>