History常用的属性和方法：
length：返回浏览器历史列表中的URL数量
back()：加载history列表中的前一个URL
forward()：加载history列表中的下一个URL
go()：加载history列表中的某个具体页面
代码：
<!DOCTYPE html>
<html>
<head >
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h1>第一个页面</h1>
<a href="historyPage2.html" target="_blank" rel="external nofollow" >下一个页面</a>
<input type="button" value="前进" οnclick="next()">
<input type="button" value="最后一个页面" οnclick="goPage()">
</body>
<script>
alert(history.length);
function next(){
history.forward();
}
function goPage(){
history.go(3);
}
</script>
</html>
<!DOCTYPE html>
<html>
<head >
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h1>第二个页面</h1>
<a href="historyPage3.html" target="_blank" rel="external nofollow" >下一个页面</a>
<input type="button" value="前进" οnclick="next()">
<input type="button" value="后退" οnclick="back()">
</body>
<script>
alert(history.length);
function next(){
history.forward();
}
function back(){
history.back();
}
</script>
</html>
<!DOCTYPE html>
<html>
<head >
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h1>第三个页面</h1>
<a href="historyPage4.html" target="_blank" rel="external nofollow" >下一个页面</a>
<input type="button" value="前进" οnclick="next()">
<input type="button" value="后退" οnclick="back()">
<input type="button" value="返回到首页" οnclick="goPage()">
</body>
<script>
alert(history.length);
function next(){
history.forward();
}
function back(){
history.back();
}
function goPage(){
history.go(-2);
}
</script>
</html>
<!DOCTYPE html>
<html>
<head >
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h1>第四个页面</h1>
<input type="button" value="后退" οnclick="back()">
</body>
<script>
alert(history.length);
function back(){
history.back();
}
</script>
</html>
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