你准备好迎接vue3.0了吗

生命周期

vue3.0中取消了 beforeCreate 和 created 两个周期，因为setup会在这个这个周期前执行，因此你可以在setup中进行你需要的处理。其他的生命周期全部以on开头。

import {
  onBeforeMount,
  onMounted,
  onBeforeUnmount,
  onBeforeUpdate,
  onDeactivated,
  onUnmounted,
  onUpdated
} from '@vue/composition-api'
export default {
  setup(){
    onBeforeMount(() =>{
      console.log('onBeforeMount');
    })
    onMounted(() =>{
      console.log('onMounted');
    })
    onBeforeUnmount(() =>{
      console.log('onBeforeUnmount');
    })
    onBeforeUpdate(() =>{
      console.log('onBeforeUpdate');
    })
    onDeactivated(() =>{
      console.log('onDeactivated');
    })
    onUnmounted(() =>{
      console.log('onUnmounted');
    })
    onUpdated(() =>{
      console.log('onUpdated');
    })
  }
}

Mixin

vue3.0中使用函数式的API代替原有的mixin，mixin很容易引起命名重合和覆盖引入mixin的页面属性。

在vue3.0中以一个API的形式存在，当你需要时，将其引入。直接看例子

mixin.vue

<template>
  <div>
    <h3>mixins</h3>
    <div>
      <el-input v-model="searchValue" type="text" @change="onSearch"/>
      <div>
        <ul>
          <li v-for="name in names" :key="name.id" v-show="name.show">
            {{name.value}}
          </li>
        </ul>
      </div>
    </div>
  </div>
</template>
​
<script>
import searchName from './searchName.js'
export default {
  setup(){
    let list = [
      {id: 1, value: 'vue', show: true},
      {id: 2, value: 'react', show: true},
      {id: 3, value: 'angular', show: true},
      {id: 4, value: 'elementui', show: true},
      {id: 5, value: 'ant', show: true},
      {id: 6, value: 'javascript', show: true},
      {id: 7, value: 'css', show: true},
    ]    var {onSearch, names, searchValue} = searchName(list)
    return {
      onSearch,
      names,
      searchValue
    }
  }
}
</script>
<style>
</style>

searchName.js

import {reactive, toRefs} from '@vue/composition-api'
​
export default function searchName(names){
  const state = reactive({
    names: names,
    searchValue: ''
  })
  const onSearch = () => {
    state.names.forEach(name => {								 
 3/4   首页 上一页 1 2 3 4 下一页 尾页