javascript 本地存储与会话存储 

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>localStorage</title>
</head>

<body>
  <h5>用于长久保存整个网站的数据，保存的数据没有过期时间，直到手动去除。</h5>
  <h2>localStorage</h2>
  <button onclick="saveData()">点我添加一个数据</button>
  <button onclick="readData()">点我读取一个数据</button>
  <button onclick="deleteData()">点我删除一个数据</button>
  <button onclick="deleteAllData()">点我清空数据</button>
</body>
<script>
  const data = { name: '小红', sex: 18 }
  function saveData() {
    localStorage.setItem('msg', '嘿!')
    localStorage.setItem('file', 'text.txt')
    localStorage.setItem('ponple', data)//	[object Object]
    //JSON.stringify()值转换为 JSON 字符串。
    localStorage.setItem('person', JSON.stringify(data))//	{"name":"小红","sex":18}
  }
  function readData() {
    console.log(localStorage.getItem('msg'))
    console.log(localStorage.getItem('file'))

    const res = localStorage.getItem('person')
    console.log(JSON.parse(res))//解析为js对象

    console.log(localStorage.getItem('person'))//获取到的普通字符串
  }
  function deleteData() {
    localStorage.removeItem('msg')
    localStorage.removeItem('file')
    localStorage.removeItem('ponple')
    localStorage.removeItem('person')
  }
  function deleteAllData() {
    localStorage.clear()
  }
</script>

</html>

　　

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>sessionStorage</title>
</head>

<body>
  <h5>临时保存同一窗口(或标签页)的数据，在关闭窗口或标签页之后将会删除这些数据。</h5>
  <h2>sessionStorage</h2>
  <button onclick="saveData()">点我添加一个数据</button>
  <button onclick="readData()">点我读取一个数据</button>
  <button onclick="deleteData()">点我删除一个数据</button>
  <button onclick="deleteAllData()">点我清空数据</button>
</body>
<script>
  const data = { name: '小红', sex: 18 }
  function saveData() {
    sessionStorage.setItem('msg', '嘿!')
    sessionStorage.setItem('file', 'text.txt')
    sessionStorage.setItem('ponple', data)//	[object Object]
    //JSON.stringify()值转换为 JSON 字符串。
    sessionStorage.setItem('person', JSON.stringify(data))//	{"name":"小红","sex":18}
  }
  function readData() {
    console.log(sessionStorage.getItem('msg'))
    console.log(sessionStorage.getItem('file'))

    const res = sessionStorage.getItem('person')
    console.log(JSON.parse(res))//解析为js对象

    console.log(sessionStorage.getItem('person'))//获取到的普通字符串
  }
  function deleteData() {
    sessionStorage.removeItem('msg')
    sessionStorage.removeItem('file')
    sessionStorage.removeItem('ponple')
    sessionStorage.removeItem('person')
  }
  function deleteAllData() {
    sessionStorage.clear()
  }
</script>

</html>

　　

posted @ 2022-05-06 17:54  lin-1  阅读(97)  评论(0)    收藏  举报