知乎网站建设第三章3-6eslint规范代码

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3-6eslint规范代码

0，1，2off,warn,error

vue/muti-word-component-names:off

3-13模块化难度上升

usemousePosition.ts

import { ref, onMounted, onUnmounted } from 'vue'
function useMousePosition() {
  const x = ref(0)
  const y = ref(0)
  const updateMouse = (e: MouseEvent) => {
    x.value = e.pageX
    y.value = e.pageY
  }
  onMounted(() => {
    document.addEventListener('click', updateMouse)
  })
  onUnmounted(() => {
    document.removeEventListener('click', updateMouse)
  })
  return {x, y}
}


export default useMousePosition

useURLLoader.ts

import { ref } from 'vue'
import axios from 'axios'


function useURLLoader<T>(url: string) {
  const result = ref<T | null>(null)
  const loading = ref(true)
  const loaded = ref(false)
  const error = ref(null)


  axios.get(url).then((rawData) => {
    loading.value = false
    loaded.value = true
    result.value = rawData.data
  }).catch(e => {
    error.value = e
    loading.value = false
  })


  return {
    result,
    loading,
    error,
    loaded
  }
}


export default useURLLoader

<template>
  <div id="app">
    <img alt="Vue logo" src="./assets/logo.png">
    <h1>{{count}}</h1>
    <h1>{{double}}</h1>
    <h1>{{greetings}}</h1>
    <p>{{error}}</p>
    <Suspense>
      <template #default>
        <div>
          <async-show />
          <dog-show />
        </div>
      </template>
      <template #fallback>
        <h1>Loading !...</h1>
      </template>
    </Suspense>
    <button @click="openModal">Open Modal</button><br/>
    <modal :isOpen="modalIsOpen" @close-modal="onModalClose"> My Modal !!!!</modal>
    <h1 v-if="loading">Loading!...</h1>
    <img v-if="loaded && Array.isArray(result)" :src="result[0].url" >
    <h1>X: {{x}}, Y: {{y}}</h1>
    <button @click="increase">👍+1</button><br/>
    <button @click="changeLang('en')">英文</button><br/>
    <button @click="changeLang('ch')">中文</button><br/>
    <button @click="updateGreeting">Update Title</button>
  </div>
</template>


<script lang="ts">
import { provide, ref, computed, reactive, toRefs, watch, onErrorCaptured, defineComponent } from 'vue'
import useMousePosition from './hooks/useMousePosition'
import useURLLoader from './hooks/useURLLoader'
import Modal from './components/Modal.vue'
import AsyncShow from './components/AsyncShow.vue'
import DogShow from './components/DogShow.vue'
interface DataProps {
  count: number;
  double: number;
  increase: () => void;
}
interface DogResult {
  message: string;
  status: string;
}
interface CatResult {
  id: string;
  url: string;
  width: number;
  height: number;
}
export default defineComponent({
  name: 'App',
  components: {
    Modal,
    AsyncShow,
    DogShow,
  },
  setup() {
    // provide 提供数据
    const lang = ref('en')
    provide('lang', lang)
    const changeLang = (type: string) => {
      lang.value = type
    }
    const error = ref(null)
    onErrorCaptured((e: any) => {
      error.value = e
      return true
    })
    const data: DataProps  = reactive({
      count: 0,
      increase: () => { data.count++},
      double: computed(() => data.count * 2),
    })
    const { x, y } = useMousePosition()
    const { result, loading, loaded } = useURLLoader<CatResult[]>('https://api.thecatapi.com/v1/images/search?limit=1')
    watch(result, () => {
      if (result.value) {
        console.log('value', result.value[0].url)
      }
    })
    const greetings = ref('')
    const updateGreeting = () => {
      greetings.value += 'Hello! '
    }
    const refData = toRefs(data)
    const modalIsOpen = ref(false)
    const openModal = () => {
      modalIsOpen.value = true
    }
    const onModalClose = () => {
      modalIsOpen.value = false
    }
    return {
      ...refData,
      greetings,
      updateGreeting,
      x,
      y,
      result,
      loading,
      loaded,
      modalIsOpen,
      openModal,
      onModalClose,
      error,
      changeLang
    }
  }
});
</script>


<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
h1 {
  font-size: 5rem;
}
button {
  font-size: 3rem;
}
</style>

vue2对于typescript的支持非常有限的vue class vue.extends

3-16-typescript对vue的加持

hellworld.vue

<template>
  <div class="hello">
    <h1>{{ msg }}</h1>
    <p>
      For a guide and recipes on how to configure / customize this project,<br>
      check out the
      <a href="https://cli.vuejs.org" target="_blank" rel="noopener">vue-cli documentation</a>.
    </p>
    <h3>Installed CLI Plugins</h3>
    <ul>
      <li><a href="https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-babel" target="_blank" rel="noopener">babel</a></li>
      <li><a href="https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-typescript" target="_blank" rel="noopener">typescript</a></li>
      <li><a href="https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-eslint" target="_blank" rel="noopener">eslint</a></li>
    </ul>
    <h3>Essential Links</h3>
    <ul>
      <li><a href="https://vuejs.org" target="_blank" rel="noopener">Core Docs</a></li>
      <li><a href="https://forum.vuejs.org" target="_blank" rel="noopener">Forum</a></li>
      <li><a href="https://chat.vuejs.org" target="_blank" rel="noopener">Community Chat</a></li>
      <li><a href="https://twitter.com/vuejs" target="_blank" rel="noopener">Twitter</a></li>
      <li><a href="https://news.vuejs.org" target="_blank" rel="noopener">News</a></li>
    </ul>
    <h3>Ecosystem</h3>
    <ul>
      <li><a href="https://router.vuejs.org" target="_blank" rel="noopener">vue-router</a></li>
      <li><a href="https://vuex.vuejs.org" target="_blank" rel="noopener">vuex</a></li>
      <li><a href="https://github.com/vuejs/vue-devtools#vue-devtools" target="_blank" rel="noopener">vue-devtools</a></li>
      <li><a href="https://vue-loader.vuejs.org" target="_blank" rel="noopener">vue-loader</a></li>
      <li><a href="https://github.com/vuejs/awesome-vue" target="_blank" rel="noopener">awesome-vue</a></li>
    </ul>
  </div>
</template>


<script lang="ts">
import { defineComponent } from 'vue'
const component = 
 defineComponent({
  name: 'HelloWorld',
  props: {
    msg: {
      required: true,
      type: String
    }
  }, 
  setup(props, context) {
    console.log(props)
    console.log(context)
  }
})
export default component;
</script>


<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h3 {
  margin: 40px 0 0;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>

teleport

瞬间移动，瞬间传送

样式在其他组件当中容易变得混乱

<template>
  <teleport to="#modal">
    <div id="center" v-if="isOpen">
      <h2><slot>this is a modal</slot></h2>
      <h2>{{lang}}</h2>
      <h2>{{currentUser && currentUser.name}}</h2>
      <button @click="buttonClick">Close</button>
    </div>
  </teleport>
</template>
<script lang="ts">
import { defineComponent, inject } from 'vue'
export default defineComponent({
  props: {
    isOpen: Boolean,
  },
  emits: {
    'close-modal': null
  },
  setup(props, context) {
    // inject 拿到 provide 提供的数据
    const lang = inject('lang')
    const currentUser = inject<{ name: string }>('currentUser')
    const buttonClick = () => {
      context.emit('close-modal')
    }
    return {
      buttonClick,
      lang,
      currentUser
    }
  }
})
</script>
<style>
  #center {
    width: 200px;
    height: 200px;
    border: 2px solid black;
    background: white;
    position: fixed;
    left: 50%;
    top: 50%;
    margin-left: -100px;
    margin-top: -100px;
  }
</style>

3-18-suspense

异步请求的困境

suspense是ue3退出的一个内置的特殊组件，返回一个promise

全局api的修改

全局配置:Vue.config->app.config

config.production被删除

vue.compoent->app.component

行为扩展类api

vue.use->app.use

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