监听 页面回退事件

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

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

<body>
    <h1>123</h1>
</body>

</html>

<script>
    /**
     * 1 模拟跳转页面 载入缓存
     * 2 监听浏览器返回事件
     * */
    //定义缓存数据
    let state = { 'name': '张三 - pushState' }
    //新增缓存数据
    window.history.pushState(state, null, '?pushState')
    //打印载入的缓存
    console.log('pushState')
    console.log(window.history.state)
    //监听浏览器返回事件
    window.onpopstate = (e) => {
        console.log(historyState)
    }

</script>
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