react做出手機數據同步顯示在界面功能

// Zinput.js
import React, {
 Component
} from 'react';
import './Zinput.css'
// NOTE: 獲取焦點事件 原生onFocus 即可
// NOTE: 離開焦點事件 原生onBlur即可
// NOTE: 輸入框數據過濾 直接在change方法里進行過濾
// NOTE: 條件處理 通過不同條件返回不同節點做條件處理
class Zinput extends Component {
 constructor(props) {
 super(props);
 this.state = {
 value: '',
 showBig: false,
 };
 this.handleChange = this.handleChange.bind(this);
 this.inputOnFocus = this.inputOnFocus.bind(this);
 this.inputOnBlur = this.inputOnBlur.bind(this);
 }
 inputOnFocus() {
 if (this.state.value.length > 0) {
 this.setState({
 showBig: true
 })
 }
 }
 inputOnBlur() {
 this.setState({
 showBig: false
 })
 if(this.props.chanegNumber){
 this.props.chanegNumber(this.state.value)
 }
 }
 handleChange(event) {
 let val = event.target.value.substr(0, 13)
 .replace(/[^\d]/g, '')
 event.target.value = val
 this.setState({
 value: val,
 showBig: true,
 });
 }
 /**
 * 根據字符串沒隔len位插入一個下滑杠，返回處理后的字符串
 * @method getStr
 * @author 朱陽星
 * @datetime 2018-04-02T09:57:58+080
 * @email zhuyangxing@foxmail.com
 * @param {String} str 待處理字符串
 * @param {Number} len 每隔位數插入下滑杠
 * @return {String} 處理后的字符串
 */
 getStr(str, len) {
 let lenth = str.length
 let len1 = len - 1
 let newStr = ''
 for (var i = 0; i < lenth; i++) {
 if (i % len === len1 && i > 0) {
 newStr += str.charAt(i) + '_'
 } else {
 newStr += str.charAt(i)
 }
 }
 if (newStr.length % (len + 1) === 0) {
 // 解決最后一位為補充項問題
 newStr = newStr.substr(0, newStr.length - 1)
 }
 return newStr
 }
 render() {
 // NOTE return 需要用圓括號包住并處理
 // NOTE 條件語句里沒有節點也要用空字符串進行處理 否則sonalint會報錯，頁面也會報錯
 const showBig = this.state.showBig ? (
 <p className="big-show">{ this.getStr(this.state.value,4) }</p>
 ) : ''
 return (
 <p className="zInput">
 <input className="input" 
 type = "text" 
 onFocus={ this.inputOnFocus }
 onBlur={ this.inputOnBlur }
 value={ this.state.value } 
 onChange={ this.handleChange }>
 </input>
 {showBig}
 </p>
 )
 }
}
export default Zinput; // Don't forget to use export default!

<!-- Zinput.css -->
.zInput{
 position: absolute;
 top:80px;
 left:40px;
 
}
.input {
 position: absolute;
 top: 0;
 left: 0;
}
.big-show {
 position: relative;
 top: -40px;
 font-size: 36px;
 line-height: 40px;
 background-color: red;
}

constructor(props) {
 super(props);
 this.handerClick2 = this.handerClick2.bind(this);
}
handerClick2(){
 // NOTE 父組件通過refs獲取子組件的state 
 console.log("使用ref獲取子組件的值",this.refs.zinput.state.value)
}
render() {
 return (
 <p className="App">
 <Zinput ref="zinput"></Zinput>
 <input type="button" value="獲取電話號碼的值22" onClick={ this.handerClick2 }/>
 </p> 
 );
}

constructor(props) {
 super(props);
 this.state = {
 phoneNumber: '',
 };
 this.handerClick = this.handerClick.bind(this);
 this.changePhoneNumber = this.changePhoneNumber.bind(this);
}
changePhoneNumber(number){
 this.setState({
 phoneNumber: number,
 })
}
handerClick(){
 // NOTE 根據react的思想是在子組件處理完某件事的時候調用父組件的方法修改父組件的state值
 console.log("使用state獲取值",this.state.phoneNumber)
}
render() {
 return (
 <p className="App">
 <Zinput ref="zinput" chanegNumber={this.changePhoneNumber}></Zinput>
 <input type="button" value="獲取電話號碼的值" onClick={ this.handerClick }/>
 </p>
 );
}