在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

Selection.rangeCount read-only property returns the number of ranges in the selection.

Before the user has clicked a freshly loaded page, the rangeCount is 0 . After the user clicks on the page, rangeCount is 1 , even if no selection is visible.

A user can normally only select one range at a time, so the rangeCount will usually be 1 . Scripting can be used to make the selection contain more than one range.

Gecko browsers allow multiple selections across table cells. Firefox allows to select multiple ranges in the document by using Ctrl+click (unless the click within an element with display: table-cell).

句法

value = sel.rangeCount
					

范例

The following example will show the rangeCount every second. Select text in the browser to see it change.

HTML

<table>
  <tr><td>a.1<td>a.2
  <tr><td>b.1<td>b.2
  <tr><td>c.1<td>c.2
					

JavaScript

window.setInterval(function () {
  console.log(window.getSelection().rangeCount);
}, 1000);
					

结果

Open your console to see how many ranges are in the selection. In Gecko browsers, you can select multiple ranges across table cells by holding down Ctrl while dragging with the mouse.

规范

规范	状态	注释
选定 API The definition of 'Selection.rangeCount' in that specification.	工作草案	Current

浏览器兼容性

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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
rangeCount	Chrome Yes	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持

完整支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

另请参阅

• Selection , the interface it belongs to.

元数据

• 最后修改： Apr 15, 2020

相关话题

1. DOM (文档对象模型)
2. Selection
3. 特性

   1. anchorNode
   2. anchorOffset
   3. focusNode
   4. focusOffset
   5. isCollapsed
   6. rangeCount
   7. type
4. 方法

   1. addRange()
   2. collapse()
   3. collapseToEnd()
   4. collapseToStart()
   5. containsNode()
   6. deleteFromDocument()
   7. extend()
   8. getRangeAt()
   9. modify()
   10. removeAllRanges()
   11. removeRange()
   12. selectAllChildren()
   13. setBaseAndExtent()
   14. toString()
5. DOM 相关页面

   1. AbortController
   2. AbortSignal
   3. AbstractRange
   4. Attr
   5. ByteString
   6. CDATASection
   7. CSSPrimitiveValue
   8. CSSValue
   9. CSSValueList
   10. CharacterData
   11. ChildNode
   12. 注释
   13. CustomEvent
   14. DOMConfiguration
   15. DOMError
   16. DOMErrorHandler
   17. DOMException
   18. DOMImplementation
   19. DOMImplementationList
   20. DOMImplementationRegistry
   21. DOMImplementationSource
   22. DOMLocator
   23. DOMObject
   24. DOMParser
   25. DOMPoint
   26. DOMPointInit
   27. DOMPointReadOnly
   28. DOMRect
   29. DOMString
   30. DOMTimeStamp
   31. DOMTokenList
   32. DOMUserData
   33. Document
   34. DocumentFragment
   35. DocumentType
   36. 元素
   37. ElementTraversal
   38. Entity
   39. EntityReference
   40. 事件
   41. EventTarget
   42. HTMLCollection
   43. MutationObserver
   44. 节点
   45. NodeFilter
   46. NodeIterator
   47. NodeList
   48. NonDocumentTypeChildNode
   49. ProcessingInstruction
   50. PromiseResolver
   51. 范围
   52. StaticRange
   53. 文本
   54. TextDecoder
   55. TextEncoder
   56. TimeRanges
   57. TreeWalker
   58. TypeInfo
   59. USVString
   60. UserDataHandler
   61. XMLDocument