React数据回显

 export function getSession(key) {  
  return sessionStorage.getItem(key)  
}  

export function setSession(key, value) {  
  sessionStorage.setItem(key, value)  
}  
  
export function clearSession(key) {  
  sessionStorage.removeItem(key)  
}  
  
export function getRouteParamSession(key) {  
  const data = JSON.parse(sessionStorage.getItem('ROUTE-PARAMS') || '{}')  
  return data[key]  
}  
   
export function setRouteParamSession(key, value) {  
  const data = JSON.parse(sessionStorage.getItem('ROUTE-PARAMS') || '{}')  
  data[key] = value  
  sessionStorage.setItem('ROUTE-PARAMS', JSON.stringify(data))  
}  
    
export function clearRouteParamSession(key) {  
  if (key === 'all') {  
    sessionStorage.removeItem('ROUTE-PARAMS')  
  } else if (key) {    // 如果 key 不是 'all'，只删除一个属性而不是整个对象  
    const data = JSON.parse(sessionStorage.getItem('ROUTE-PARAMS') || '{}')  
    if (data[key]) {  
      delete data[key]  
      sessionStorage.setItem('ROUTE-PARAMS', JSON.stringify(data))  
    }  
  }    
}

// 暂存当前页面的请求参数，达到在返回页面保持状态
const saveParams = (params)=>{
  setRouteParamSession('data1', params)
}
const getParams = ()=>{
  return getRouteParamSession('data1')
}

刷新页面清空数据

   // 页面刷新（hooks）
  useEffect(()=>{
    const handleBeforeUnload = () => {
      clearRouteParamSession('data1')
    }
    window.addEventListener('beforeunload', handleBeforeUnload)
    return () => {
      window.removeEventListener('beforeunload', handleBeforeUnload)
      if (React.$share) {
        React.$share.destroy()
      }
    }
  },[])

//（类组件，生命周期）
  handleBeforeUnload = () =>{
    clearRouteParamSession('data1')
  }

  componentDidMount() {
    window.addEventListener('beforeunload', this.handleBeforeUnload)
  }

  componentWillUnmount(){
    window.removeEventListener('beforeunload', this.handleBeforeUnload)
  }