本来在 showPic函数里不修改title属性可以正常运行，但是一加上description的文字可以运行，但是一加上后面那一段就不行了，求帮忙<!doctype html><html><head> <meta charset="UTF-8"> <title>Document</title></head><body> <ul id="imagegellery"> <li> <a href="1.jpg" title="第1张图片">第1张图片</a> </li> <li> <a href="2.jpg" title="第2张图片">第2张图片</a> </li> <li> <a href="3.jpg" title="第3张图片">第3张图片</a> </li> </ul><script> function addLoadEvent(func){ var oldonload=window.onload; if(typeof window.onload!='function'){ window.onload=func; }else{ window.onload=function(){ oldonload(); func(); } } } function insertAfter(newElement,targetElement){ var parent=targetElement.parentNode; if(parent.lastChild==targetElement){ parent.appendChild("newElement"); }else{ parent.insertBefore(newElement,targetElement.nextSibling); } } function preparePlaceholder(){ var placeholder=document.createElement("img"); placeholder.setAttribute("id","placeholder"); placeholder.setAttribute("src","4.jpg"); placeholder.setAttribute("alt","默认图片"); var description=document.createElement("p"); var description=document.createElement("id","description"); var desctext=document.createTextNode("默认图片"); description.appendChild(desctext); var gallery=document.getElementById("imagegellery"); insertAfter(placeholder,gallery); insertAfter(description,gallery); } function preareGallery(){ var gallery=document.getElementById("imagegellery"); var links=gallery.getElementsByTagName("a") for (var i = 0; i < links.length; i++) { links[i].onclick=function(){ return showPic(this); } links[i].onkeypress=links[i].onclick; };}function showPic(whichpic){ var source=whichpic.getAttribute("href"); var placeholder=document.getElementById("placeholder") placeholder.setAttribute("src",source) if(whichpic.getAttribute("title")){ var text=whichpic.getAttribute("title");} else{var text="";} var description=document.getElementById("description") if(description.firstChild.nodeType==3){ description.firstChild.nodeValue=text; } return false;}addLoadEvent(preparePlaceholder)addLoadEvent(preareGallery)</script> </body></html>
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