代码情况

import { ref,computed,watch,reactive } from 'vue'
import { RouterView,RouterLink,useRoute,useRouter } from 'vue-router'
import HelloWorld from './components/HelloWorld.vue'
function toggleRoute(){const temprou = useRoute()console.log(temprou);
}

正确

import { ref,computed,watch,reactive } from 'vue'
import { RouterView,RouterLink,useRoute,useRouter } from 'vue-router'
const temprou = useRoute()
import HelloWorld from './components/HelloWorld.vue'
function toggleRoute(){console.log(temprou);
}

总结

• 我使用了vue3的setup语法糖。
• 如果是非vue3 setup语法糖，useRouter和useRoute函数不能在setup里面的函数体内部执行，要放在顶部或者其他位置，不然作用域改变，执行后的router/route是 undefined。

非 setup 语法糖 错误写法

import { useRoute } from 'vue-router'
const useRoute1 = useRoute()export default {setup() {console.log(useRoute1);}}

非 setup 语法糖 正确

import { useRoute } from 'vue-router'
export default {setup() {const route = useRoute()console.log(route.params)}
}