日久弥新
2018-01-26 11:39
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<div><i id="oldnode">JavaScript</i>是一个很常用的技术,为网页添加动态效果。</div>
<a href="javascript:replaceMessage()"> 将加粗改为斜体</a><br/>
<a href="javascript:replaceMessage1()">将斜体改为粗体</a>
<script type="text/javascript">
function replaceMessage(){
var oldHTML= oldnode.innerHTML;
var newnode=document.createElement("b");
var oldNode=document.getElementById("oldnode");
oldNode.parentNode.replaceChild(newnode,oldNode);
newnode.innerHTML=oldHTML;
}
function replaceMessage1(){
var oldHTML=oldnode.innerHTML;
var newnode=document.createElement("b");
var oldNode=document.getElementById("oldnode");
oldNode.parentNode.replaceChild(newnode,oldNode);
newnode.innerHTML=oldHTML;
}
</script>
</body>
</html>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<div><i id="oldnode">JavaScript</i>是一个很常用的技术,为网页添加动态效果。</div>
<a href="javascript:replaceMessage()"> 将加粗改为斜体</a><br/>
<a href="javascript:replaceMessage1()">将斜体改为粗体</a>
<script type="text/javascript">
function replaceMessage(){
var newnode=document.createElement("i");
newnode.id='oldnode';
var oldNode=document.getElementById("oldnode");
console.log('i',oldNode)
var oldHTML= oldNode.innerHTML;
oldNode.parentNode.replaceChild(newnode,oldNode);
newnode.innerHTML=oldHTML;
}
function replaceMessage1(){
var newnode=document.createElement("b");
newnode.id='oldnode';//由于是根据id去获取的信息,但是在下面你进行重置的时候,将<i id="oldnode">JavaScript</i>替换后没有了id='oldnode'所以会报错,同时你的标签在由加粗变为斜体时,标签应该变化为i
var oldNode=document.getElementById("oldnode");
var oldHTML=oldNode.innerHTML;
oldNode.parentNode.replaceChild(newnode,oldNode);
newnode.innerHTML=oldHTML;
}
</script>
</body>
</html>
JavaScript进阶篇
468060 学习 · 21891 问题
相似问题