<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<input type="button" value="前进" onclick="func1();">
<input type="button" value="后退" onclick="func2();">
<a href="history_lesson2.html">lesson</a>
<script>
function func1() {
//history.forward();
history.go(2);
}
// history内部三种方法：forward back go 一个属性：length
function func2() {
//history.back();
history.go(-1);
alert(history.length);
}
</script>
</body>
</html>