Vue 读取HTMLCollection列表的length为0

通过document.getElementById获取元素之后，输出tb.rows显示有值，tb.rows.length 为0，并且也用了this.$nextTick，但是还是为0

表格数据是异步加载的吧，应该在异步加载成功之后再调用nextTick
或者参考https://blog.csdn.net/weixin_41602509/article/details/86661758?spm=1005.2026.3001.5635&utm_medium=distribute.pc_relevant_ask_down.none-task-blog-2~default~OPENSEARCH~default-5.pc_feed_download_top3ask&depth_1-utm_source=distribute.pc_relevant_ask_down.none-task-blog-2~default~OPENSEARCH~default-5.pc_feed_download_top3ask