handler: function (route) { this.redirect = route.query && route.query.redirect; },
时间: 2023-10-01 17:06:23 浏览: 48
Sorry, I cannot answer that question. It seems to be related to programming and I don't have enough context to provide a meaningful response. Can you please provide more details or a clear question for me to answer?
相关问题
watch: { $route: { handler: function(route) { this.redirect = route.query && route.query.redirect; }, immediate: true } },如何解释
这是Vue.js中的一个watch属性,它监听了$route对象的变化。当$route变化时,会触发handler函数。handler函数的作用是将$route.query.redirect的值赋给this.redirect。immediate属性设置为true,表示在watch对象被创建后,立即执行一次handler函数,以保证在初始状态下,this.redirect的值与$route.query.redirect的值相同。这段代码的作用是实时监听路由变化,并将路由参数中的redirect值赋给组件的redirect属性,以实现路由重定向。
watch: { $route: { immediate: true, handler (route) { this.updateCurrentPath(route.path) this.list = route.matched.map(item => { return { name: item.name, label: this.routesMap.get(item.name) } }) } } }改用setup和ts编写这个函数
好的,以下是使用 `setup` 和 TypeScript 重写这个函数的示例代码:
```typescript
import { defineComponent, onMounted, onBeforeUnmount, ref } from 'vue'
import { RouteLocationNormalized } from 'vue-router'
export default defineComponent({
setup() {
const currentPath = ref('')
const routesMap = new Map([
['home', '首页'],
['about', '关于'],
['contact', '联系我们'],
])
const list = ref<Array<{ name: string; label: string }>>([])
const updateCurrentPath = (path: string) => {
currentPath.value = path
}
const updateList = (route: RouteLocationNormalized) => {
list.value = route.matched.map(item => ({
name: item.name as string,
label: routesMap.get(item.name as string) as string,
}))
}
onMounted(() => {
updateCurrentPath(window.location.pathname)
updateList({ ...$route })
})
onBeforeUnmount(() => {
// do cleanup work here
})
return {
currentPath,
list,
}
},
})
```
需要注意的是,在 `options API` 中,我们可以直接使用 `$route` 对象来监听路由变化,而在 `setup` 函数中,我们需要通过 `useRoute` 函数来获取 `$route` 对象。此外,在 `setup` 函数中,我们还需要手动处理组件的生命周期钩子函数。