Vue2中:
// 之前 (Vue 2.x)
Vue.prototype.$http = () => {
}
Vue3:
// 之后 (Vue 3.x)
const app = createApp({
})
app.config.globalProperties.$http = () => {
}
过滤器
已被移除,我们刚好可以用全局方法:
app.config.globalProperties.KaTeX parse error: Expected '}', got 'EOF' at end of input: … { return `${str}`
}
}
声明文件 不然TS无法正确类型 推导
type Filter = {
format<T>(str: T): string
}
// 声明要扩充@vue/runtime-core包的声明.
// 这里扩充"ComponentCustomProperties"接口, 因为他是vue3中实例的属性的类型.
declare module 'vue' {
export interface ComponentCustomProperties {
$filters: Filter
}
}
setup读取值
import {
getCurrentInstance, ComponentInternalInstance } from 'vue';
const {
appContext } = <ComponentInternalInstance>getCurrentInstance()
console.log(appContext.config.globalProperties.$env);
推荐第二种方式
import {
ref,reactive,getCurrentInstance} from 'vue'
const app = getCurrentInstance()
console.log(app?.proxy?.$filters.format('js'))
我们还可以用全局注入的方式:
先定义一个文件api.js
import http from "./http";
export const api = {
async getUserInfo(){
return await http.get('/userInfo')
}
}
main.js
import {
createApp } from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
import {
api } from "@/api/index";
onst app = createApp(App)
app.use(store).use(router).mount('#app')
app.provide('api', api);//全局发送api
任何一个子组件child.js
<script>
import {
useStore } from "vuex";
import {
inject, onBeforeMount, ref } from "vue";
export default {
name: 'Child',
setup(props) {
const $http = inject('api')
onBeforeMount(async() => {
const res = await $http.getUserInfo()
console.log(res);
//...其余操作
})
},
}
</script>