Opera 中的 Document.body
[英]Document.body in Opera
问题描述
I've got a problem with retrieving link to the body tag.
我在检索到 body 标签的链接时遇到了问题。 I've tried:我试过了：
-
document.body, unfortunately it is nulldocument.body，不幸的是它是 null - search body by tagName while enumerating childs of document, it's found only the head tag:(在枚举文档的子项时按 tagName 搜索正文，它只找到了头标签:(
-
document.getElementsByTagName, return undefineddocument.getElementsByTagName，返回未定义
I'm trying to get link to the body tag in onload event handler.我正在尝试在 onload 事件处理程序中获取指向 body 标记的链接。 This is a HTML code of the page:这是页面的 HTML 代码：
<html>
<head>
<title>Some page</title>
<script src="/adv.js" type="text/javascript"></script>
</head>
<body>
This is text
</body>
</html>
Here the source code of adv.js :这里是adv.js的源代码：
(function () {
var myRandom = function (min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
};
var myFunction = function () {
var newScriptAddr = '/adLoader.js?r=' + myRandom(1,1000000);
var fileref = document.createElement('script');
if (typeof fileref != "undefined")
{
fileref.setAttribute("type", "text/javascript");
fileref.setAttribute("src", newScriptAddr);
document.getElementsByTagName("head")[0].appendChild(fileref);
}
};
if (window.onload)
{
var currOnLoad = window.onload;
window.onload = function () {
currOnLoad();
myFunction();
};
}
else
window.onload = myFunction();
}) ();
Source code of adLoader.js : adLoader.js的源代码：
(function () {
var mainCnt = document.createElement('div');
mainCnt.appendChild(document.createTextNode('The text'));
var _body = document.body;
if (!_body)
{
var htmlTag = document.documentElement;
for(var i = 0; i < htmlTag.childNodes.length; i++)
{
if (htmlTag.childNodes[i].nodeName.toLowerCase() == 'body')
{
_body = htmlTag.childNodes[i];
break;
}
}
}
if (!_body)
_body = document.getElementsByTagName('BODY') [0];
if (!_body)
_body = document.getElementsByTagName('body') [0];
if (_body)
_body.appendChild(mainCnt);
else
alert('WTF!!');
}) ();
Browser is Opera 11.10 OS Ubuntu Linux.浏览器是 Opera 11.10 OS Ubuntu Linux。 Is there way to get this link?有没有办法得到这个链接？ My aim is to add div with position:fixed to the body tag.我的目标是添加带有position:fixed到 body 标签的 div。
2 个解决方案
解决方案1
3 已采纳 2011-06-29 09:56:45
myFunction() doesn't return a function, so you are assigning undefined to window.onload . myFunction()不返回 function，因此您将undefined分配给window.onload 。 You probably mean window.onload = myFunction;您可能的意思是window.onload = myFunction;
Anyway, as written at the moment, the code runs immediately and the body element hasn't been reached.无论如何，正如目前所写的那样，代码会立即运行并且还没有到达 body 元素。
解决方案2
-1 2011-06-29 06:39:13
if the js code in head tag and the query the body tag before onload event, null should be got while browser just reading the head.如果head标签中的js代码和onload事件之前查询body标签，浏览器读取head时应该得到null。
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