How to define default slot?

Hello, Now I want to define a slot and default slot, but I didn’t find any good way. please help me to resolve this.

💻 Sample code

renderSlot(slots, 'default')

// this is what I want to define the default slot
<Button type="primary" htmlType="submit">登录</Button>

[linkscope]

OK, 我已经解决了该问题，最后使用h函数成功渲染出了后备内容，感谢您的回答

            {renderSlot(slots, 'default', {}, () => [
              h(
                Button,
                {
                  loading: store.state.isLoading,
                  type: 'primary',
                  htmlType: 'submit',
                  shape: 'round',
                  size: 'large'
                },
                '完成'
              )
            ])}

[nonzzz]

后备内容，Vue官方称其为fallback content，即如果不使用该插槽会默认显示的内容，我现在不清楚如何设置

<slot>如果不使用该插槽，默认展示这里的数据</slot>

好吧，我觉得你想表达的是不是这样？

import { defineComponent } from "vue";

const Component = defineComponent({
  setup(props, { slots }) {
    const safeSlots = !!slots?.default;
    const defaultMessage = () => <span>默认信息</span>;

    return () => <div>{safeSlots ? slots.default() : "你想要的默认信息或者你写个渲染函数放这里"}</div>;
  }
});

@linkscope