有关appendChild的Javascript问题
[英]Javascript Question regarding appendChild
问题描述
Im just learning javascript and I'm just wondering why this doesn't work. 
我只是学习javascript，我只是想知道为什么这行不通。 I've created a button and when it is clicked I assigned a function which is supposed to append some text to all my paragraphs. 我创建了一个按钮，当单击它时，我分配了一个函数，该函数应该在我的所有段落中附加一些文本。 I don't know why it doesn't work: 我不知道为什么它不起作用：
<html>
<head>
<title>javascript test</title>
</head>
<body>
<script language="javascript" type="text/javascript">
function appendStuff(){
var node = document.getElementsByTagName("P");
node.appendChild.createTextNode('Here's some text');
return true;
}
</script>
<noscript>
Your browser doesn't support javascript.
</noscript>
<input type="submit" value="click me" onclick="appendStuff();" />
<p>
This is the first paragraph.
</p>
<p>
This is the second paragraph.
</p>
<p>
This is the third paragraph.
</p>
</body>
</html>
6 个解决方案
解决方案1
2 已采纳 2011-06-27 04:46:37
you should pass new node as argument to appendChild method, like here: 您应该将新节点作为参数传递给appendChild方法，例如：
var nodes = document.getElementsByTagName("P");
for(var i=0; i<nodes.length; i++) {
nodes[i].appendChild(document.createTextNode("Here's some text"));
}
解决方案2
0 2011-06-27 04:46:53
document.getElementsByTagName返回一个元素列表（数组），而不是一个元素列表，您必须选择一个想要追加的元素（即node [0]）
解决方案3
0 2011-06-27 04:50:10
Try this 尝试这个
<html>
<body>
<script language="JavaScript">
function function11() {
var myNode = document.createTextNode("New Text Node");
document.body.appendChild(myNode);
}
</script>
<button onclick="function11();">Create text node</button>
</body>
</html>
解决方案4
0 2011-06-27 04:53:59
function appendStuff(){
var node = document.getElementsByTagName("P");
var txt = 'Here is some text';
var newT = document.createTextNode(txt);
node.appendChild(newT);
return true;
}
Try the above method!!!! 尝试以上方法！！！
解决方案5
0 2011-06-27 05:23:48
> <script language="javascript"
> type="text/javascript">
The language attribute has been deprecated for over a decade, it should not be used. 语言属性已弃用了十多年，不应使用。
> function appendStuff(){ var node = document.getElementsByTagName("P");
> node.appendChild.createTextNode('Here's some text');
> return true;
> }
As others have pointed out, getElemetsByTagName returns a live NodeList , which has a length property and whose members can be accessed by index. 正如其他人指出的那样， getElemetsByTagName返回一个活动的NodeList ，它具有length属性，并且其成员可以通过索引访问。 Note that while it is array-like, it is not an array. 请注意，虽然它类似于数组，但不是数组。
A text element can be appended to the first node in the NodeList using: 可以使用以下命令将文本元素附加到NodeList中的第一个节点：
node[0].appendChild(document.createTextNode("Here's some text"));
However it is much safer to first see if node[0] exists before attempting to call one of its methods. 但是，在尝试调用其方法之一之前首先查看node[0]存在更加安全。
> <noscript> Your browser doesn't
> support javascript. </noscript>
The fact that a browser displays a noscript element doesn't necessarily mean that the browser doesn't support javascript. 浏览器显示noscript元素的事实并不一定意味着该浏览器不支持javascript。 The description of a noscript element includes: noscript元素的描述包括：
The NOSCRIPT element allows authors to provide
alternate content when a script is not executed.
W3C, HTML4.01 , §18.3.1 W3C， HTML4.01和§18.3.1
> <input type="submit" value="click me"
> onclick="appendStuff();" />
An input with a type of submit is intended to be in a form and be used to submit the form. 带有提交类型的输入旨在采用表格形式，并用于提交表格。 A more appropriate value for the type attribute here is "button". 这里的type属性更合适的值是“ button”。 And the XML-style closing tag is unnecessary. 而且，不需要XML样式的结束标记。
解决方案6
-1 2011-06-27 04:49:24
document.getElementsByTagName return 'array' of fetched doms rather than one dom. document.getElementsByTagName返回获取的Dom的“数组”，而不是一个dom。 so you need to specify single dom with for loop of this array or sth likely. 因此，您需要使用此数组或sth的for循环指定单个dom。
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