<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>localStorage</title>
</head>
<body>
    <h2>localStorage</h2>
    <button onclick="saveData()">点击保存一个数据</button><br/>
    <button onclick="readData()">点击读取一个数据</button><br/>
    <button onclick="deleteData()">点击删除一个数据</button><br/>
    <button onclick="deleteAllData()">点击清空数据</button><br/>
    <script type="text/javascript">
        let p = {name:'测试' , age:18}
        function saveData() {
            localStorage.setItem('msg', 'Hello!!')
            localStorage.setItem('msg2', 666)
            localStorage.setItem('person', JSON.stringify(p))
        }
        function readData() {
            console.log(localStorage.getItem('msg'))
            console.log(localStorage.getItem('msg2'))
            console.log(JSON.parse(localStorage.getItem('person')))
            console.log(localStorage.getItem('msg3'))
        }
        function deleteData() {
            localStorage.removeItem('msg')
        }
        function deleteAllData() {
            localStorage.clear()
        }
    </script>
</body>
</html>