我们的志愿者还没有将这篇文章翻译为 中文 (简体)。加入我们帮助完成翻译！
The Range.collapsed read-only property returns a Boolean flag indicating whether the start and end points of the Range are at the same position. It returns true if the start and end boundary points of the Range are the same point in the DOM, false if not.
A collapsed Range is empty, containing no content, specifying a single-point in a DOM tree. The collapsed property is read-only. To collapse a range, see the Range.collapse() method.
Syntax
isCollapsed = range.collapsed;
Example
var range = document.createRange(); range.setStart(startNode,startOffset); range.setEnd(endNode,endOffset); isCollapsed = range.collapsed;
Specifications
| Specification | Status | Comment |
|---|---|---|
| DOM The definition of 'Range.collapsed' in that specification. |
Living Standard | No change. |
| Document Object Model (DOM) Level 2 Traversal and Range Specification The definition of 'Range.collapsed' in that specification. |
Recommendation | Initial specification. |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | 1.0 (1.7 or earlier) | 9.0 | 9.0 | (Yes) |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | (Yes) | 1.0 (1.0) | 9.0 | 9.0 | (Yes) |