Vue.js进阶知识点总结

created(){
  this.fetchPostList()
},
watch: {
  searchInputValue(){
    this.fetchPostList()
  }
}

watch: {
  searchInputValue:{
    handler: 'fetchPostList',
    immediate: true
  }
}

import BaseButton from './baseButton'
import BaseIcon from './baseIcon'
import BaseInput from './baseInput'

export default {
 components: {
  BaseButton,
  BaseIcon,
  BaseInput
 }
}

<BaseInput
 v-model="searchText"
 @keydown.enter="search"
/>
<BaseButton @click="search">
 <BaseIcon name="search"/>
</BaseButton>

import Vue from 'vue'

function capitalizeFirstLetter(string) {
 return string.charAt(0).toUpperCase() + string.slice(1)
}

const requireComponent = require.context(
 '.', false, /\.vue$/
  //找到components文件夹下以.vue命名的文件
)

requireComponent.keys().forEach(fileName => {
 const componentConfig = requireComponent(fileName)

 const componentName = capitalizeFirstLetter(
  fileName.replace(/^\.\//, '').replace(/\.\w+$/, '')
  //因为得到的filename格式是: './baseButton.vue', 所以这里我们去掉头和尾，只保留真正的文件名
 )

 Vue.component(componentName, componentConfig.default || componentConfig)
})

data() {
 return {
  loading: false,
  error: null,
  post: null
 }
}, 
watch: {
 '$route': {
  handler: 'resetData',
  immediate: true
 }
},
methods: {
 resetData() {
  this.loading = false
  this.error = null
  this.post = null
  this.getPost(this.$route.params.id)
 },
 getPost(id){

 }
}

data() {
 return {
  loading: false,
  error: null,
  post: null
 }
},
created () {
 this.getPost(this.$route.params.id)
},
methods () {
 getPost(postId) {
  // ...
 }
}

<router-view :key="$route.fullpath"></router-view>

<template>
 <li
  v-for="route in routes"
  :key="route.name"
 >
  <router-link :to="route">
   {{ route.title }}
  </router-link>
 </li>
</template>


 ERROR - Component template should contain exactly one root element. 
  If you are using v-if on multiple elements, use v-else-if 
  to chain them instead.

functional: true,
render(h, { props }) {
 return props.routes.map(route =>
  <li key={route.name}>
   <router-link to={route}>
    {route.title}
   </router-link>
  </li>
 )
}

//父组件
<BaseInput 
  :value="value"
  label="密码" 
  placeholder="请填写密码"
  @input="handleInput"
  @focus="handleFocus>
</BaseInput>

//子组件
<template>
 <label>
  {{ label }}
  <input
   :value="value"
   :placeholder="placeholder"
   @focus=$emit('focus', $event)"
   @input="$emit('input', $event.target.value)"
  >
 </label>
</template>

<input
   :value="value"
   v-bind="$attrs"
   @input="$emit('input', $event.target.value)"
  >

<input
  :value="value"
  v-bind="$attrs"
  v-on="listeners"
>

computed: {
 listeners() {
  return {
   ...this.$listeners,
   input: event => 
    this.$emit('input', event.target.value)
  }
 }
}