Javascript IE4 DOM

很多IE独有的DOM特性是沿袭自IE4的，所以有必要看看IE4 DOM的特性，与W3C的DOM模型有所区别。

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IE 4 does not support childNodes[], but it provides a similar children[] array on its Document and HTMLElement objects.

IE 4 does not have a Text node type and does not consider strings of text to be children.

the textual content of a <p> tag is available through the IE 4 innerText property

IE4 不支持childNodes[]，但是有children[]，功能相似；
IE4没有文本节点这回事，根本就不把文本串当做一个子节点。
要修改节点的文本内容，必须要用innerText属性。

Finding Document Elements
寻找元素

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IE 4 does not support the getElementById() and getElementsByTagName() methods of the Document object.

Instead, the Document object and all document elements have an array property named all[].
Note that all[] does not simply represent the children of the document or the element; it represents all descendants, no matter how deeply nested.

If there is more than one such element (which can happen, because it is common to have multiple form elements, such as radio buttons, with the same name attribute), the result is an array of those elements.

IE4不支持getElementById()、getElementByTagName()等Document方法。（IE6肯定支持啊）

但是，每个节点都有一个all[]属性，代表了该元素的所有子节点。该属性可以通过元素的name属性进行更进一步的访问。如果某个节点的子孙节点有多个元素含有同一个name属性，那么通过all[]返回的仍然是数组。
all[]数组本身还有一个tags()方法，通过传递一个标签名来进一步筛选。
IE4中，标签名必须是大写。

var specialParagraph = document.all["special"];
var buttons = form.all["shippingMethod"];  // May return an array

var specialParagraph = document.all.special;
var buttons = form.all.shippingMethod;

Using the all[] array in this way provides the same basic functionality as getElementById() and getElementsByName().

a tags() method that can be used to obtain an array of elements by tag name.

var lists = document.all.tags("UL");  // Find all <ul> tags in the document
var items = lists[0].all.tags("LI");  // Find all <li> tags in the first <ul>

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Note, however, that in IE 4, the tag name must be specified using all uppercase letters.

The IE 4 HTMLElement object defines setAttribute(), getAttribute(), and removeAttribute() methods as well.

IE4中HTMLElement对象也定义了setAttribute(), getAttribute(), 和removeAttribute()方法。

Modifying Documents
修改文档

IE里面修改文档可以直接通过这几个属性更改文档内容：
innerHTML outerHTML innerText outerText insertAdjacentHTML() insertAdjacentText()

概念和innerHTML类似，这个让然觉得比较疯狂。