vue3 常见问题汇总

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vue3 如何注册全局组件

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import { createApp } from 'vue'
import App from './App.vue'
const app = createApp(App)
// 注册全局组件
import SaveButton from '@/globalComponents/SaveButton'
app.component('SaveButton', SaveButton)
app.mount('#app')

vue3 如何自定义全局指令

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import { createApp } from 'vue'
import App from './App.vue'
const app = createApp(App)
// 注册全局自定义指令 `v-focus`
app.directive('focus', {
  inserted: function (el) {
    el.focus()
  },
})
app.mount('#app')

vue3 如何全局混入

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import { createApp } from 'vue'
import App from './App.vue'
const app = createApp(App)
// 全局混入
app.mixin({
  beforeCreate() {
    console.log('我是全局mixin')
  },
})
app.mount('#app')

vue3 如何挂载全局属性和方法

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import { createApp } from 'vue'
import App from './App.vue'
import axios from 'axios'
const app = createApp(App)
// 全局ctx(this) 上挂载 $axios
app.config.globalProperties.$axios = axios
app.mount('#app')

vue3 setup 函数里如何拿到 vue-router 的$router，$route

通过getCurrentInstance或者useRoute ,useRouter

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import { getCurrentInstance, unref } from 'vue'
import { useRoute, useRouter } from 'vue-router'
export default {
export default {
  setup() {
    //  拿到当前组件 this(ctx)
    const { ctx } = getCurrentInstance()
    // 拿到  $router
    // const $router = useRouter()
    const $router = ctx.$router
    // 拿到  $route
    //  const $route = useRoute()
    const $route = unref(ctx.$router.currentRoute)
  }
}
thank u !