现象

el-input被外层div包裹了，设置autofocus不起作用：

<el-dialog v-model="visible" :title="title" :append-to-body=true width="50%"><el-form v-model="theForm" @submit.prevent="submit"><el-form-item v-for="item in formItems" :label="item.label" :label-width="120"><el-input v-model="theForm[item.name]" ref="inputRef"autocomplete="off"           @keyup.enter.stop="submit"autofocus/></el-form-item></el-form><template #footer><span><el-button type="primary" @click="cancel()">取消</el-button><el-button type="primary" @click="submit()">确定</el-button></span></template></el-dialog>

在onMounted()中尝试: inputRef.value.focus()，也无效。怀疑是调用时机不对，但何时才是页面dom都生成好的时机呢？

两次nextTick()加setTimeout()解决

javascript">// 需要调用两次nextTick才能获得实例!!!
const focusInput = () => { nextTick(() => nextTick(()=>{    setTimeout(function () {let _eles = document.querySelectorAll('form input.el-input__inner')// console.log(_eles)_eles[0].focus()// inputRef.value.focus()}, 100);}))}onMounted(() => {focusInput()
})

结论

在vue3组件嵌套复杂时，很难确定组件之间的初始化顺序，这时尽可能让访问时机靠后是一个通用的解决方法。