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react-start-0.html
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react-start-0.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</title>
<script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
<script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
<meta charset="utf-8">
<title>Reactjs in 40 </title>
<style media="screen">
.like-btn-a { font-size: 50px; }
</style>
</head>
<body>
<div class="wrapper_0">
<button class='like-btn'>
<span class='like-text'>点赞</span>
<span>👍</span>
</button>
</div>
<div class="wrapper_1">
</div>
<div class="wrapper_2_1">
</div>
<div class="wrapper_a">
</div>
<div class='wrapper'>
<button class='like-btn'>
<span class='like-text'>点赞</span>
<span>👍</span>
</button>
<script type="text/javascript">
class LikeButton {
render () {
return `
<button id='like-btn'>
<span class='like-text'>赞</span>
<span>👍</span>
</button>
`
}
}
class LikeButton2{
render(){
this.el=createDOM
}
}
const button = document.querySelector('.like-btn')
const buttonText = document.querySelector('.like-text')
let isLiked = false
button.addEventListener('click',()=>{
isLiked = !isLiked
if(isLiked){
buttonText.innerHTML = 'cancel'
}else{
buttonText.innerHTML = 'ok'
}
},false)
const wrapper = document.querySelector('.wrapper')
const likeButton1 = new LikeButton()
wrapper.innerHTML = likeButton1.render()
console.log('1')
const likeButton2 = new LikeButton()
wrapper.innerHTML+=likeButton2.render()
console.log('2')
class LikeButtonDom{
constructor(){
this.state = {isLiked:false}
}
changeLikeText(){
const likeText = this.el.querySelector('.like-text')
this.state.isLiked = !this.state.isLiked
likeText.innerHTML = this.state.isLiked?'取消':'点赞'
}
render(){
this.el = createDOMFromString(
`
<button class='like-button'>
<span class='like-text'>点赞赞</span>
<span>👍</span>
</button>
`)
this.el.addEventListener('click',this.changeLikeText.bind(this),false)
return this.el;
}
}
const createDOMFromString = (domString)=>{
const div = document.createElement('div')
div.innerHTML = domString
return div
}
const wrapper_1 = document.querySelector('.wrapper_1')
const likeButton_1 = new LikeButtonDom()
wrapper_1.appendChild(likeButton_1.render())
const likeButton_2 = new LikeButtonDom()
wrapper_1.appendChild(likeButton_2.render())
class LikeButton_2_1{
constructor(){
this.state = {isLiked:false}
}
setState(state){
const oldEl = this.el
this.state = state
this.el = this.render()
if(this.onStateChagne)this.onStateChagne(oldEl,this.el)
}
changeLikeText(){
this.setState({
isLiked:!this.state.isLiked
})
}
render(){
this.el = createDOMFromString(
`
<button class='like-btn'>
<span class='like-text'>${this.state.isLiked?'取消':'点赞'}</span>
<span>👍👍</span>
</button>
`
)
this.el.addEventListener('click',this.changeLikeText.bind(this),false)
return this.el
}
}
const wrapper_2_1 = document.querySelector('.wrapper_2_1')
const likeButton_2_1 = new LikeButton_2_1()
wrapper_2_1.appendChild(likeButton_2_1.render())
likeButton_2_1.onStateChagne = (oldEl,newEl)=>{
wrapper_2_1.insertBefore(newEl,oldEl)
wrapper_2_1.removeChild(oldEl)
}
// 组件
class Component{
constructor(props={}){
this.props = props
}
setState(state){
// 获取老的dom
const oldEl = this.el
// 记录新的状态
this.state = state
// 执行dom渲染操作
this._renderDOM()
if(this.onStateChange) this.onStateChange(oldEl,this.el)
}
_renderDOM(){
// 根据子类的render返回的字符串信息生成新的dom
this.el = createDOMFromString(this.render())
// 如果当前组件存在onClick事件，则向dom中添加onClick事件的回调
if(this.onClick){
this.el.addEventListener('click',this.onClick.bind(this),false)
}
// 返回新的dom
return this.el
}
}
const mount = (component,wrapper)=>{
wrapper.appendChild(component._renderDOM())
component.onStateChange = (oldEl,newEl)=>{
wrapper.insertBefore(newEl,oldEl)
wrapper.removeChild(oldEl)
}
}
class LikeButtonSub extends Component{
constructor(props){
super(props)
this.state = {isLiked:false}
}
onClick(){
this.setState({
isLiked:!this.state.isLiked
})
}
render(){
return
`
<button class='like-btn-a' style="background-color:${this.props.bgColor}">
<span class='like-text-a'>
${this.state.isLiked?'取消':'点赞'}
</span>
<span>👍</span>
</button>
`
}
}
class RedBlueButton extends Component{
constructor(props){
super(props)
this.state={
color:'red'
}
}
onClick(){
this.setState({
color:'blue'
})
}
render(){
return
`
<div style='color:${this.state.color};'>${this.state.color}</div>
`
}
}
const _wrapper_a = document.querySelector('.wrapper_a')
mount(new LikeButtonSub({bgColor:'red'}),_wrapper_a)
mount(new LikeButtonSub(),_wrapper_a)
mount(new RedBlueButton(),_wrapper_a)
</script>
</div>
</body>
</html>