使用react實現(xiàn)手機號的數(shù)據(jù)同步顯示功能的示例代碼

// 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(shù)據(jù)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(jié)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(jù)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(shù)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(jié)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 ? (
   <div className="big-show">{ this.getStr(this.state.value,4) }</div>
  ) : ''
  return (
   <div className="zInput">
    <input className="input" 
        type = "text" 
        onFocus={ this.inputOnFocus }
        onBlur={ this.inputOnBlur }
        value={ this.state.value } 
        onChange={ this.handleChange }>
        </input>
    {showBig}
   </div>
  )
 }
}

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 (
  <div className="App">
   <Zinput ref="zinput"></Zinput>
   <input type="button" value="獲取電話號碼的值22" onClick={ this.handerClick2 }/>
  </div> 
 );
}

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(jù)react的思想是在子組件處理完某件事的時候調(diào)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 (
  <div className="App">
   <Zinput ref="zinput" chanegNumber={this.changePhoneNumber}></Zinput>
   <input type="button" value="獲取電話號碼的值" onClick={ this.handerClick }/>
  </div>
 );
}