1.html文件
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Man bites dog</title>
<link rel="stylesheet" type="text/css" href="styles/story.css">
</head>
<body>
<h1>Hold the front page</h1>
<p>This first paragraph leads you in.</p>
<p>Now you get the nitty-gritty of the story.</p>
<p>The most important information is delivered first.</p>
<h1>Extra! Extral!</h1>
<p>Further developemnts are it here.</p>
<p>You can read all about it here.</p> <script type="text/javascript" src="scripts/styleHeaderSiblings.js"></script>
</body>
</html>
2.css代码
.intro{
font-weight: bold;
font-size: 1.2em;
}
3.js代码
function addLoadEvent(func) {
var oldonload = window.onload;
if(typeof window.onload != "function"){
window.onload = func;
}else{
window.onload = function(){
oldonload();
func();
}
}
}
function getNextElement(node){
if(node.nodeType == 1){
return node;
}
if(node.nextSibling){
return getNextElement(node.nextSibling);
}
return null;
}
function addClass(element, value){
if(!element.className){
element.className = value;
}else{
var newClassName = element.className;
newClassName += " ";
newClassName += value;
element.className = newClassName;
}
}
function styleHeaderSiblings(){
if(!document.getElementsByTagName) return false;
var headers = document.getElementsByTagName("h1");
var elem;
for(var i = 0; i < headers.length; i++){
elem = getNextElement(headers[i].nextSibling);
addClass(elem, "intro");
}
}
addLoadEvent(styleHeaderSiblings);