Range.setStartBefore() - Web API 接口参考 编辑

Range.setStartBefore() 方法相对另一个 Node来设置一个Range 的开始位置. Range的开始节点（focusNode）的父节点，和  referenceNode的父节点是同一个.

Syntax

range.setStartBefore(referenceNode);

Parameters

referenceNode

一个Range新的开始位置上的Node.

Example

var range = document.createRange();
var referenceNode = document.getElementsByTagName("div").item(0);

range.setStartBefore(referenceNode);

Specifications

Specification	Status	Comment
DOM Range.setStartBefore()	Living Standard	No change.
Document Object Model (DOM) Level 2 Traversal and Range Specification Range.setStartBefore()	Obsolete	Initial specification.

Browser compatibility

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The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• The DOM interfaces index