JS动态实现：每个h2后添加top回到顶部

最新推荐文章于 2022-12-15 09:51:32 发布

鱼儿跳

最新推荐文章于 2022-12-15 09:51:32 发布

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分类专栏： JS 文章标签： js javascript html

本文链接：https://blog.youkuaiyun.com/xin9910/article/details/73694567

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本文介绍了一个使用HTML和JavaScript创建的基本网页结构，并演示了如何通过JavaScript动态地为每个二级标题后添加返回顶部链接的功能。

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html：

<!DOCTYPE html>
<html>
<head>
	<title>Char 12 test</title>
	<meta charset="utf-8">
	<script src="after.js"></script>
	<!--<script type="text/javascript">window.onload = insertAfter();</script>-->
</head>
<body>
	<div id="top"></div>
	<h2 id="hh">first</h2>
	<p id="pp">123bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cook well]a person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur</p>
	<h2>second</h2>
	<p>
		erson who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cook well]a person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who dle running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Onoes something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only am
	</p>
	<h2>third</h2>
	<p>
		erson who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cook well]a person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who dle running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Onoes something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only amateurs make this kind of mistake.He's a mere amateur when it comes to cooking. [=he doesn't know how to cooka person who does something poorly : a person who is not skillful at a job or other activity.The people running that company are a bunch of amateurs.Only am
	</p>
	<script type="text/javascript">
		
		// var n = document.createElement("a");
		// var text = document.createTextNode("link");
		// n.appendChild(text);
		// n.setAttribute("href","www.baidu.com");
		// n.setAttribute("value","链接");
		// var pV= document.getElementById("hh");
		//console.log(pV);
		//insertAfter(n,pV);
		window.onload= function(){
			// insertAfter(n,pV);
			Totop();
		}
		

	</script>
</body>
</html>

JS文件：after.js

function insertAfter(newNode,ObjNode){
	        console.log(ObjNode);
			var parent = ObjNode.parentNode;
			console.log(parent);
			console.log(parent.lastChild);
			if(ObjNode == parent.lastChild){
				parent.appendChild(newNode);
			} else {
				console.log(ObjNode.nextSibling);
				parent.insertBefore(newNode,ObjNode.nextSibling);
			}
		}

function Totop(){
	var h2s = document.getElementsByTagName("h2");
	
	for(var i=0 ; i<h2s.length ; i++){
		var a = document.createElement("a");
		var text = document.createTextNode("top");
		a.appendChild(text);
		a.setAttribute("href","#top");
		insertAfter(a,h2s[i]);
	}
}
window.onload = Totop;