javascript 无法调用未定义的方法 appendChild
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cannot call method appendChild of undefined
提问by Learner2011
I get this error when I insert a a href tag inside innerHtml in the javascript (flickrshow-7.1.js), for inserting a link for an image. Images are pulled from the flickr account using flickrshow javascript and displayed in the website as slideshow.
当我在 javascript (flickrshow-7.1.js) 的innerHtml 中插入aa href 标签以插入图像链接时出现此错误。图像是使用 flickrshow javascript 从 flickr 帐户中提取的，并作为幻灯片显示在网站上。
a.onLoadWindow = function() {
a.elements.target = typeof a.elements.target === "string" ? document.getElementById(a.elements.target) : a.elements.target;
a.elements.target.innerHTML = '<a href="http://www.google.com"><div class="flickrshow-container" style="background:transparent;height:' + a.elements.target.offsetHeight + "px;margin:0;overflow:hidden;padding:0;position:relative;width:" + a.elements.target.offsetWidth + 'px"></div></a>';
回答by JaredPar
The undefinederror means the javascript variable you are tying to call appendChildon doesn't have a value. You need to fix the initialization so it has a value on which to call appendChild
该undefined错误意味着您要调用的 javascript 变量appendChild没有值。您需要修复初始化，以便它具有要调用的值appendChild
<p id="parent"></p>
...
var newNode = document.createElement("li");
var parent;
parent.appendChild(newNode); // Error!!! What is parent?
parent = document.getElementById("parent");
parent.appendChild(newNode);
回答by kennebec
An img element has no innerHTML, and you can not append a child node to an img. Wrap the images in the a elements instead.
img 元素没有innerHTML，您不能将子节点附加到img。将图像包装在 a 元素中。
