Cannot read properties of undefined (reading 'focus')"

问题的原因是获取的元素没有出来，等同于undefined.focus。解决办法有两种。一种是在外面加定时器，另一种是使用$nextTick。\[3\]在使用$nextTick的方法中，可以在模板中使用ref来获取元素，然后在方法中使用this.$nextTick来确保元素已经渲染完毕后再进行操作，例如this.$refs.ipt.focus()。这样就可以避免出现Cannot read properties of undefined (reading 'focus')的错误。
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