index
<a href="20.list.html">点我去列表页</a>
<button>前进</button>
<script>
var btn = document.querySelector('button');
btn.addEventListener('click', function () {
history.go(1);
})
</script>
list
<a href="/JavaScrpit第十天/20.history对象.html">点我去首页</a>
<button>后退</button>
<script>
var btn = document.querySelector('button');
btn.addEventListener('click', function () {
history.go(-1);
})
</script>