我又来问弱智小问题了! Js的弱智小问题
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>图片库</title>
<style>
#placeholder{
height: 500px;;
width: 500px;
border: 1px solid black;
}
</style>
</head>
<body>
<h1 title="This is title">Snapshots</h1>
<ul id="images">
<li>
<a href="案例研究/1.JPG" title="A fireworks display">Fireworks</a>
</li>
<li>
<a href="案例研究/2.JPG" title="B fireworks display">Coffee</a>
</li>
<li>
<a href="案例研究/3.JPG" title="C fireworks display">Rose</a>
</li>
<li>
<a href="案例研究/5.JPG" title="D fireworks display">Big Ben</a>
</li>
</ul>
<img id="placeholder" src="案例研究/155537pb4aaxk4abawq555.jpg" alt="My image Gallery">
<P id="description">This is my picture.</P>
<script src="scripts/showPic.js" type="text/javascript"></script>
</body>
</html>
js:
addLoadEvent(prepareGallery);
function prepareGallery() {
if(!document.getElementsByTagName||document.getElementById)return false;
if(!document.getElementById("images"))return false;
var gallery=document.getElementById("images");
var links=gallery.getElementsByTagName("a");
for(var i=0;i<links.length;i++){
links[i].onclick=function () {
return showPic(this)?false:true;
}
}
}
function showPic(whichpic) {
if (!document.getElementById("placeholder"))return false;
var source= whichpic.getAttribute("href");
var placeholder=document.getElementById("placeholder");
if (placeholder.nodeName !="IMG") return false;
placeholder.setAttribute("src",source);//替换图片
if(document.getElementById("description")) {
var text=whichpic.getAttribute("title")?whichpic.getAttribute("title"):"";
var description = document.getElementById("description");
if (description.firstChild.nodeType==3){
description.firstChild.nodeValue=text;
}
}
return true;
}
function addLoadEvent(func){
var oldonload=window.onload;
if(typeof window.onload!='function'){
window.onload=func;
}else{
window.onload=function () {
oldonload();
func;}
}
}//这个函数用于在页面加载之后执行的函数的函数,参数为要执行的函数
为什么我的html和js执行起来 点击链接会跳转啊,我也没办法判断我的JS 替换文字和图片是否执行
大神帮帮我啊 !