React组件
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| cd ~/Desktop
create-react-app react-button-demo
cd react-button-demo
yarn start
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styles.css
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| .App {
text-align: center;
}
.App button{
border:1px solid red;
background: red;;
color:#fff;
padding:3px 10px;
box-shadow: 0 0 3px rgba(0,0,0,0.2);
margin:4px;
border-radius: 4px;
}
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App.js
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| import React, { Component } from 'react';
import './App.css';
class App extends Component {
render() {
return (
<div className="App">
<button>Hello</button>
<button>Hello</button>
</div>
);
}
}
export default App;
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此时如果 另一个组件里想用这个 button 唯一的办法就是把 样式copy一份 button
第一个组件 BoxOne
BoxOne.js
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| import React, { Component } from 'react';
import './BoxOne.css';
class BoxOne extends Component {
render() {
console.log(this.props.firstLine)
return (
<div className="BoxOne">
<div> {this.props.firstLine || 'Box 1'} </div>
</div>
);
}
}
export default BoxOne;
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BoxOne.css
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| .BoxOne{
border:1px solid green;
}
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App.js
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| import React, { Component } from 'react';
import './App.css';
import BoxOne from './BoxOne'
class App extends Component {
render() {
return (
<div className="App">
<button className="btn">Hello</button>
<button className="btn">Hello</button>
<BoxOne firstLine="Hello" />
<BoxOne/>
</div>
);
}
}
export default App;
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组件的好处是什么？
- 当你的组件不复杂时 你直接写一遍就好了
- 但如果组件重复的使用了 100次呢？
- 如果后期改样式 你是不是得改1000次？
- 不需要 ctrl + c / ctrl + v
- 多处用 一个 标签
- 要改，只改一个地方
- 个性化只需要传递参数
- src下新建 components 目录
- src/components/button.js
button.js
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| import React, { Component } from 'react';
import './button.css'
class Button extends Component {
render() {
return (
<button className="button2">{this.props.value}</button>
);
}
}
export default Button;
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button.css
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| .button2{
box-sizing: border-box;
height: 32px;
background: #fff;
border:1px solid rgba(153,153,153,1);
border-radius: 4px;
padding:4px 1em;
margin:10px;
}
.button2:focus{
outline: none;
border-color: black;
}
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App.js
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| import React, { Component } from 'react';
import './App.css';
import Button from './components/button'
class App2 extends Component {
render() {
return (
<div className="App">
<Button value="按钮"/>
<Button value="按钮"/>
<Button value="按钮"/>
</div>
);
}
}
export default App2;
|
做个涟漪效果
button.css
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| .button2{
box-sizing: border-box;
height: 32px;
background: #fff;
border:1px solid rgba(153,153,153,1);
border-radius: 4px;
padding:4px 1em;
margin:10px;
position: relative;
overflow: hidden;
}
.button2:focus{
outline: none;
border-color: black;
}
.button2 > .circle{
border-radius: 50%;
height: 10px;
width: 10px;
background: red;
display: inline-block;
animation: 1s big;
position: absolute;
}
@keyframes big{
0%{
transform: scale(0.1);
}
100%{
transform: scale(10);
}
}
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button.js
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| import React, { Component } from 'react';
import './button.css'
class Button extends Component {
constructor(props){
super(props);
this.state = {
active:false,
}
}
x(){
this.setState({
active:true,
})
}
render() {
return (
<button className="button2"
onClick={ this.x.bind(this) }
>
{ this.props.value }
{ (this.state.active === true)?(
<span className="circle"></span>
):''}
</button>
);
}
}
export default Button;
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此时我希望涟漪出现的地方是我点击的地方
button.js
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| import React, { Component } from 'react';
import './button.css'
class Button extends Component {
constructor(props){
super(props);
this.state = {
active:false,
deltaX:0,
deltaY:0
}
// 当前节点
this.myRef = React.createRef();
}
x(event){
// 事件源
console.log(event);
// 距离左边的距离
console.log(event.clientX);
// 距离上面的距离
console.log(event.clientY);
// 当前按钮的引用
console.log(this.myRef);
// 获取边缘属性
console.log(this.myRef.current.getBoundingClientRect())
//
let {x,y} = this.myRef.current.getBoundingClientRect();
let {clientX,clientY} = event;
let deltaX = clientX - x - 5;
let deltaY = clientY - y - 5;
// 得到点击的位置
console.log(deltaX,deltaY);
this.setState({
active:true,
deltaX:deltaX,
deltaY:deltaY
})
}
y(){
this.setState({
active:false
})
}
render() {
return (
<button ref={this.myRef} className="button2"
onClick={ this.x.bind(this) }
>
<span className="value">{ this.props.value }</span>
{ (this.state.active === true)?(
<span className="circle" onAnimationEnd={ this.y.bind(this) } style={{left:this.state.deltaX,top:this.state.deltaY}}></span>
):''}
</button>
);
}
}
export default Button;
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button.css
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| .button2{
box-sizing: border-box;
height: 32px;
background: #fff;
border:1px solid rgba(153,153,153,1);
border-radius: 4px;
padding:4px 1em;
margin:10px;
position: relative;
overflow: hidden;
}
.button2:focus{
outline: none;
border-color: black;
}
.button2 > .circle{
border-radius: 50%;
height: 10px;
width: 10px;
background: #ddd;
opacity: 0.5;
display: inline-block;
/* 结束后不恢复原状 */
animation: 1s big forwards;
position: absolute;
z-index: 0;
}
.button2 > .value{
position: relative;
z-index: 1;
}
@keyframes big{
0%{
transform: scale(0.1);
}
100%{
transform: scale(10);
}
}
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