<!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>
<style>
body {
height: 5000px;
}
</style>
<script>
//window.history; 浏览器的后退前进对象。
window.history; //前进后退。
history.back();
history.go(-1);
var bt = document.getElementById('bt');
bt.onclick = function() {
history.back();
}
</script>
</body>
</html>