标签：extends code exp classname data div val nod rop
import React,{Component} from ‘react‘; import ‘../assets/css/index.css‘; class Todolist extends Component { constructor(props) { super(props); this.state = { list:[ // { // title:‘录制ionic‘, // checked:true // }, // { // title:‘录制nodejs‘, // checked:false // } // , // { // title:‘录制egg.js‘, // checked:true // } , // { // title:‘录制vue‘, // checked:false // } ] }; } addData=(e)=>{ //按下回车的时候在增加 if(e.keyCode==13){ // alert(title); let title=this.refs.title.value; let tempList=this.state.list; tempList.push({ title:title, checked:false }) //改变后的值赋值给list this.setState({ list:tempList }) //表单置为空 this.refs.title.value=‘‘; //执行缓存数据 localStorage.setItem(‘todolist‘,JSON.stringify(tempList)); } } checkboxChage=(key)=>{ // alert(‘111‘); let tempList=this.state.list; tempList[key].checked=!tempList[key].checked; this.setState({ list:tempList }) //执行缓存数据 localStorage.setItem(‘todolist‘,JSON.stringify(tempList)); } removeData=(key)=>{ let tempList=this.state.list; tempList.splice(key,1); this.setState({ list:tempList }) //执行缓存数据 localStorage.setItem(‘todolist‘,JSON.stringify(tempList)); } //生命周期函数 页面加载就会触发 componentDidMount(){ //获取缓存的数据 var todolist=JSON.parse(localStorage.getItem(‘todolist‘)); /*字符串*/ if(todolist){ this.setState({ list:todolist }) } } render() { return ( <div> <header className="title">TodoList: <input ref="title" onKeyUp={this.addData} /> </header> <h2>待办事项</h2> <hr /> <ul> { this.state.list.map((value,key)=>{ if(!value.checked){ return ( <li key={key}> <input type="checkbox" checked={value.checked} onChange={this.checkboxChage.bind(this,key)} /> {value.title} -- <button onClick={this.removeData.bind(this,key)}>删除</button> </li> ) } }) } </ul> <h2>已完成事项</h2> <hr /> <ul> { this.state.list.map((value,key)=>{ if(value.checked){ return ( <li key={key}> <input type="checkbox" checked={value.checked} onChange={this.checkboxChage.bind(this,key)} /> {value.title} -- <button onClick={this.removeData.bind(this,key)}>删除</button> </li> ) } }) } </ul> </div> ); } } export default Todolist;
storage.js模块封装：
var storage={
set(key,value){
localStorage.setItem(key,JSON.stringify(value));
},
get(key){
return JSON.parse(localStorage.getItem(key));
},remove(key){
localStorage.removeItem(key)
}
};
export default storage;
使用：
import React,{Component} from ‘react‘; import ‘../assets/css/index.css‘; //引入自定义模块 import storage from ‘../model/storage‘; class Todolist extends Component { constructor(props) { super(props); this.state = { list:[ ] }; } addData=(e)=>{ //按下回车的时候在增加 if(e.keyCode==13){ // alert(title); let title=this.refs.title.value; let tempList=this.state.list; tempList.push({ title:title, checked:false }) //改变后的值赋值给list this.setState({ list:tempList }) //表单置为空 this.refs.title.value=‘‘; //执行缓存数据 storage.set(‘todolist‘,tempList); } } checkboxChage=(key)=>{ // alert(‘111‘); let tempList=this.state.list; tempList[key].checked=!tempList[key].checked; this.setState({ list:tempList }) //执行缓存数据 storage.set(‘todolist‘,tempList); } removeData=(key)=>{ let tempList=this.state.list; tempList.splice(key,1); this.setState({ list:tempList }) //执行缓存数据 storage.set(‘todolist‘,tempList); } //生命周期函数 页面加载就会触发 componentDidMount(){ //获取缓存的数据 var todolist=storage.get(‘todolist‘); if(todolist){ this.setState({ list:todolist }) } } render() { return ( <div> <header className="title">TodoList: <input ref="title" onKeyUp={this.addData} /> </header> <h2>待办事项</h2> <hr /> <ul> { this.state.list.map((value,key)=>{ if(!value.checked){ return ( <li key={key}> <input type="checkbox" checked={value.checked} onChange={this.checkboxChage.bind(this,key)} /> {value.title} -- <button onClick={this.removeData.bind(this,key)}>删除</button> </li> ) } }) } </ul> <h2>已完成事项</h2> <hr /> <ul> { this.state.list.map((value,key)=>{ if(value.checked){ return ( <li key={key}> <input type="checkbox" checked={value.checked} onChange={this.checkboxChage.bind(this,key)} /> {value.title} -- <button onClick={this.removeData.bind(this,key)}>删除</button> </li> ) } }) } </ul> </div> ); } } export default Todolist;
标签：extends code exp classname data div val nod rop
原文地址：https://www.cnblogs.com/loaderman/p/11552624.html
