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Range.collapse() 方法向边界点折叠该 Range 。
折叠后的 Range 为空，不包含任何内容。
要确定 Range 是否已折叠，使用Range.collapsed 属性。
语法
range.collapse(toStart);
参数
- toStart 可选
- 一个布尔值：
true折叠到Range的 start 节点，false折叠到 end 节点。如果省略，则默认为 false.
例子
var range = document.createRange();
referenceNode = document.getElementsByTagName("div").item(0);
range.selectNode(referenceNode);
range.collapse(true);
规范
| Specification | Status | Comment |
|---|---|---|
| DOM Range.collapse() |
Living Standard | The parameter is now optional and default to false. |
| Document Object Model (DOM) Level 2 Traversal and Range Specification Range.collapse() |
Obsolete | Initial specification. |
浏览器兼容性
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
collapse | Chrome Full support Yes | Edge Full support 12 | Firefox Full support 4 | IE Full support 9 | Opera Full support 9 | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android ? |
toStart parameter optional | Chrome Full support Yes | Edge ? | Firefox Full support 25 | IE
No support
No
| Opera Full support 15 | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support 25 | Opera Android Full support 14 | Safari iOS Full support Yes | Samsung Internet Android ? |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- See implementation notes.
- See implementation notes.