怎么实现上面输入框输入内容，下面输入框同时输入上面的内容？

Question

Answer 1

使用 computed() 合并三者即可：

import { ref, computed } from 'vue'

const province = ref('')
const city = ref('')
const district = ref('')

const address = computed(()=> [province.value, city.value, district.value].join(' '))

实例：playground