HTML DOM Element 属性 previousSibling

定义和用法

previousSibling 属性返回同一树级别的上一个节点，以 Node 对象。

previousSibling 属性是只读的。

注释：如果没有 previousSibling 节点，则返回值是 null。

注意

previousSibling 返回上一个同胞节点：元素节点、文本节点或注释节点。

空格也是文本节点。

替代方案：

属性 previousElementSibling - Returns the previous sibling element (ignores text and comment nodes).

See also：

nextSibling property

firstChild property

lastChild property

childNodes property

hasChildNodes() property

HTML node and element

In HTML DOM（Document Object Model）, the HTML document is a collection of nodes that have (or do not have) child nodes.

NodeRefers to element nodes, text nodes, and comment nodes.

ElementThe whitespace between them is also a text node.

And element is just an element node.

Sibling vs element sibling

SiblingIs 'brother' and 'sister'.

SiblingIs a node that has the same parent node (in the same childNodes in the list）.

Element siblingIs an element that has the same parent element (in the same children in the list）.

Child nodes vs child elements

childNodes ReturnsChild node（Element node, text node, and comment node）.

children ReturnsChild element（Not text and comment nodes）.

nextSibling vs nextElementSibling

nextSibling Returns the nextNode（Element node, text node, or comment node）. The whitespace between elements is also a text node.

nextElementSibling Returns the nextElement（Does not return text and comment nodes）.

previousSibling vs previousElementSibling

previousSibling Returns the previousNode（Element node, text node, or comment node）. The whitespace between elements is also a text node.

previousElementSibling Returns the previousElement（Does not return text and comment nodes）.

Example

Returns the HTML content of the previous sibling list item:

document.getElementById("item2").previousSibling.innerHTML;

Try it yourself

Syntax

element.previousSibling

or

node.previousSibling

Return value

Type Description
Node The previous sibling node of the element.
null If there is no previous sibling.

Browser support

element.previousSibling It is a DOM Level 1 (1998) feature.

All browsers fully support it:

Chrome IE Edge Firefox Safari Opera
Chrome IE Edge Firefox Safari Opera
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