本文详细介绍了如何使用DOM方法处理服务器响应，包括获取元素的各种方法如getElementById及getElementsByTagName等，并解释了节点属性如childNodes与nodeValue的作用。
第三章介绍处理服务器响应的方式。重点是DOM的操作方法和属性。
| Property Name | Description |
| childNodes | Returns an array of the current element’s children |
| firstChild | Returns the first direct child of the current element |
| lastChild | Returns the last child of the current element |
| nextSibling | Returns the element immediately following the current element |
| nodeValue | Specifies the read/write property representing the element’s value |
| parentNode | Returns the element’s parent node |
| previousSibling | Returns the element immediately preceding the current element |
| Method Name | Description |
| getElementById(id) (document) | Retrieves the element in the document that has the specified unique ID attribute value |
| getElementsByTagName(name) | Returns an array of the current element’s children that have the specified tag name |
| hasChildNodes() | Returns a Boolean indicating whether the element has any child elements |
| getAttribute(name) | Returns the value of the element’s attribute specified by name |
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