个回答

• 张轩

  2018-10-10 11:29:19

  已采纳

  拼写错误 componentDidMont 应该是 componentDidMount， 下次注意欧

  0

• 张轩

  2018-10-09 16:24:08

  代码贴来看看

  0

• qq_嶸歸_0

  2018-10-09 16:38:46

  import React, { Component } from 'react';
  import Clock from './Clock';
  
  class App extends Component {
  render() {
  return (
  <div>
  <Clock />
  </div>
  );
  }
  }
  
  export default App;

  0

• qq_嶸歸_0

  2018-10-09 16:38:11

  
  

  import React from 'react';

  class Clock extends React.Component{

  constructor(props){

  super(props);

  this.state={

  date:new Date()

  }

  }

  componentDidMont(){

  this.timer=setInterval( ()=>{

  this.setState({

  date: new Date()

  })

  }, 1000)

  }

  componentDidUpdate(currentProps,currentState){

  console.log(currentState)

  }

  componentWillUnmount(){

  clearInterval(this.timer)

  }

  render(){

  return(

  <h1>{this.state.date.toLocaleTimeString()}</h1>

  )

  }

   }

   export default Clock;

  
  

  0

• qq_嶸歸_0

  2018-10-09 16:36:10

  
  

  hao

  0