React和Vue特性和书写差异
Vue均使用ES6语法,主要以单文件组件为例,写法上优先使用缩写。
React使用TS语法。
生命周期
- Vue
- React
入口&根实例
- Vue
const app = new Vue({
/* 选项 */
render: (h) => h(App) // App为根组件
}).$mount('#app')
- React
ReactDOM.render(
<App/>, // App为根组件
document.getElementById('app')
)
组件定义
- Vue
// 定义组件构造器
var MyComponent = Vue.extend({/* 选项 */})
// 注册全局组件
Vue.component('my-component', {/* 选项 */})
<!-- 单文件组件 -->
<template>
<div class="my-component">hello</div>
</template>
<script>
export default {
/* 选项 */
}
</script>
- React
// 无状态组件
const Foo = () => {
return <div className='foo'></div>
}
// 完整组件
class Foo extends React.Component<{}, void> {
render () {
return <div className='foo'>hello</div>
}
}
组件引用
- Vue
<!-- 以单文件组件为例:Foo.js -->
<template>
<div class="Foo">
<!-- 必须小写,不能自闭合 -->
<bar></bar>
</div>
</template>
<script>
// 引入组件
import Bar from './Bar'
export default {
name: 'Foo',
components: {Bar}
}
</script>
- React
import Bar from './Bar'
class Foo extends React.Component<{}, void> {
render () {
return (
<div className='foo'>
{/* 组件约定大写开头,可自闭合 */}
<Bar/>
</div>
)
}
}
组件内部状态
- Vue
<template>
<div class="foo">
<p class='name'>{{name}}</p>
<p class='age'>
{{age}}
<button @click="onAdd">add</button>
</p>
</div>
</template>
<script>
export default {
data () {
return {
name: 'Tom',
age: 18
}
},
methods {
onAdd () {
// 直接修改
this.age++
}
}
}
</script>
- React
interface IFooState {
name: string,
age: number
}
class Foo extends React.Component<{}, IFooState> {
state = {
name: 'tom',
age: 18
}
onAdd = () => {
// 必须通过setState修改
this.setState({
age: this.state.age + 1
})
}
render () {
const {name, age} = this.state
return (
<div className='foo'>
<p class='name'>{name}</p>
<p class='age'>
{age}
<button onClick={this.onAdd}>add</button>
</p>
</div>
)
}
}
父子组件通讯
- Vue
<!-- Parent.vue -->
<template>
<div class="parent">
<child name='tom' :age='18' @click="onAdd"></child>
</div>
</template>
<script>
export default {
data () {
return {
age: 18
}
},
methods {
onAdd () {
this.age++
}
}
}
</script>
<!-- Child.vue -->
<template>
<div class="child">
<p class='name'>{{name}}</p>
<p class='age'>
{{age}}
<button @click="onAdd">add</button>
</p>
</div>
</template>
<script>
export default {
props: {
name: {type: String},
age: {type: Number, default: 18}
},
methods {
onAdd () {
this.$emit('click')
}
}
}
</script>
- React
interface IChildProps {
name: string,
age?: number,
onAdd?: () => void
}
class Child extends React.Component<IChildProps, void> {
static defaultProps = {
age = 18,
onAdd: () => {}
}
render () {
const {name, age} = this.props
return (
<div className='child'>
<p class='name'>{name}</p>
<p class='age'>
{age}
<button onClick={this.onAdd}>add</button>
</p>
</div>
)
}
}
interface IParentState {
age: number
}
class Parent extends React.Component<{}, IParentState> {
state = {
age: 18
}
onAdd = () => {
this.setState({
age: this.state.age + 1
})
}
render () {
const {name, age} = this.state
return (
<div className='parent'>
<Child name='Tom' age={18} onAdd={this.onAdd}></Child>
</div>
)
}
}
模板/JSX语法
- Vue
<!-- 可搭配其他模板语言,如Pug等 -->
<template>
<!-- 变量 -->
<div>{{name}}</div>
<!-- 表达式 -->
<div>{{ ok ? 'YES' : 'NO' }}</div>
<!-- HTML -->
<div v-html="rawHtml"></div>
<!-- 属性:属性名必须小写(kebab-case) -->
<div id="app"></div>
<div :id="dynamicId"></div>
<foo :task-count="18"></foo>
<foo :class="['item', foo]"></foo>
<foo :style="{'margin-top': '10px'}"></foo>
<!-- 事件 -->
<foo @action="onAction"></foo>
</template>
- React
render () {
return (
<!-- 变量 -->
<div>{name}</div>
<!-- 表达式 -->
<div>{ ok ? 'YES' : 'NO' }</div>
<!-- HTML -->
<div dangerouslySetInnerHTML={rawHtml}></div>
<!-- 属性 -->
<div id='app'></div>
<div id={dynamicId}></div>
<foo taskCount={18}></foo>
<foo className={'item ' + foo}></foo>
<foo style={{marginTop: 10}}></foo>
<!-- 事件 -->
<foo onAction="onAction"></foo>
)
}
条件渲染
- Vue
<template>
<div v-if="foo">foo</div>
</template>
<template>
<div v-if="foo">foo</div>
<div v-else-if="bar">bar</div>
</template>
<template>
<div v-if="foo">foo</div>
<div v-else-if="bar">bar</div>
<div v-else>other</div>
</template>
- React
render () {
return foo && <div>foo</div>
}
render () {
return foo ? <div>foo</div> : <div>bar</div>
}
render () {
return (
{ foo ? <div>foo</div>
: bar
? <div>bar</div>
: <div>other</div>
}
)
}
列表渲染
- Vue
<template>
<div class='list'>
<div v-for="item in list" :key="item">{{item}}</div>
</div>
</template>
- React
render () {
return (
<div className='list'>
{list.map((item) => <div key={item}>{item}</div>)}
</div>
)
}
// 或者
render () {
const items = list.map((item) => <div key={item}>{item}</div>)
return (
<div className='list'>
{items}
</div>
)
}
表单&双向绑定
- Vue
<!-- 表单 -->
<template>
<form>
<input v-model="name">
<!--
相当于以下的语法糖:
<input v-bind:value="name" v-on:input="name = $event.target.value">
在组件中相当于
<foo v-bind:value="name" v-on:input="name = arguments[0]"></foo>
-->
</form>
</template>
<script>
export default {
data () {
return {
name: ''
}
}
}
</script>
<!-- Vue 2.3.0+ -->
<!-- Parent.vue -->
<template>
<child :foo.sync="bar"></child>
<!--
sync只是语法糖,实际上拓展为:
<child :foo="bar" @update:foo="val => bar = val"></child>
-->
</template>
<!-- Child.vue -->
<script>
export default {
methods: {
onChange () {
this.$emit('update:foo', newValue)
}
}
}
</script>
- React
interface IFooState {
name: string
}
class Foo extends React.Component<{}, IFooState> {
onChange = (e) => {
const name = e.target.value
this.setState({name})
}
render () {
const {value} = this.state
return (
<div>
<input value={value} onChange={this.onChange}/>
</div>
)
}
}
内容分发
- Vue
<!-- Child -->
<template>
<!-- 必须有根元素 -->
<div class="child">
<slot name="header"></slot>
<slot></slot>
<slot name="footer"></slot>
</div>
</template>
<script>
export default {}
</script>
<!-- Parent -->
<template>
<div class="parent">
<child>
<p slot="header">header</p>
<p>content</p>
<p slot="footer">footer</p>
</child>
</div>
</template>
<script>
import Child from './Child'
export default {
components: {Child}
}
</script>
- React
interface IChildProps {
header?: React.Node,
children?: React.Node,
footer?: React.Node
}
class Child extends React.Component<IChildProps, void> {
render () {
const {header, children, footer} = this.props
return (
<div className='child'>
{header}
{children}
{footer}
</div>
)
}
}
class Parent extends React.Component<{}, void> {
render () {
return (
<div className='parent'>
<Child
className='child'
header='header'}
footer={<p>footer</p>}>
<p>content</p>
</Child>
</div>
)
}
}