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window.length - Web API | MDN

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1. 開発者向けのウェブ技術
2. Web API
3. Window
4. window.length

• • English (US)
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このページはコミュニティーの尽力で英語から翻訳されました。MDN Web Docs コミュニティーについてもっと知り、仲間になるにはこちらから。

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• 概要
• 構文
• 例
• 仕様書

1. Window
2. インスタンスプロパティ
   1. caches
   2. closed
   3. cookieStore
   4. credentialless Experimental
   5. crossOriginIsolated
   6. crypto
   7. customElements
   8. devicePixelRatio
   9. document
   10. documentPictureInPicture Experimental
   11. event 非推奨;
   12. external 非推奨;
   13. fence Experimental
   14. frameElement
   15. frames
   16. fullScreen 非標準
   17. history
   18. indexedDB
   19. innerHeight
   20. innerWidth
   21. isSecureContext
   22. launchQueue Experimental
   23. length
   24. localStorage
   25. location
   26. locationbar
   27. menubar
   28. mozInnerScreenX 非標準
   29. mozInnerScreenY 非標準
   30. name
   31. navigation Experimental
   32. navigator
   33. opener
   34. orientation 非推奨;
   35. origin
   36. originAgentCluster
   37. outerHeight
   38. outerWidth
   39. parent
   40. performance
   41. personalbar
   42. scheduler
   43. screen
   44. screenLeft
   45. screenTop
   46. screenX
   47. screenY
   48. scrollbars
   49. scrollMaxX 非標準
   50. scrollMaxY 非標準
   51. scrollX
   52. scrollY
   53. self
   54. sessionStorage
   55. sharedStorage Experimental
   56. speechSynthesis
   57. status 非推奨;
   58. statusbar
   59. toolbar
   60. top
   61. trustedTypes
   62. visualViewport
   63. window
3. インスタンスメソッド
   1. alert()
   2. atob()
   3. blur() 非推奨;
   4. btoa()
   5. cancelAnimationFrame()
   6. cancelIdleCallback()
   7. captureEvents() 非推奨;
   8. clearImmediate() 非標準 非推奨;
   9. clearInterval()
   10. clearTimeout()
   11. close()
   12. confirm()
   13. createImageBitmap()
   14. dump() 非標準
   15. fetch()
   16. fetchLater() Experimental
   17. find() 非標準
   18. focus()
   19. getComputedStyle()
   20. getDefaultComputedStyle() 非標準
   21. getScreenDetails() Experimental
   22. getSelection()
   23. matchMedia()
   24. moveBy()
   25. moveTo()
   26. open()
   27. postMessage()
   28. print()
   29. prompt()
   30. queryLocalFonts() Experimental
   31. queueMicrotask()
   32. releaseEvents() 非推奨;
   33. reportError()
   34. requestAnimationFrame()
   35. requestFileSystem() 非標準 非推奨;
   36. requestIdleCallback()
   37. resizeBy()
   38. resizeTo()
   39. scroll()
   40. scrollBy()
   41. scrollByLines() 非標準
   42. scrollByPages() 非標準
   43. scrollTo()
   44. setImmediate() 非標準 非推奨;
   45. setInterval()
   46. setResizable() 非標準 非推奨;
   47. setTimeout()
   48. showDirectoryPicker() Experimental
   49. showOpenFilePicker() Experimental
   50. showSaveFilePicker() Experimental
   51. sizeToContent() 非標準
   52. stop()
   53. structuredClone()
   54. webkitConvertPointFromNodeToPage() 非標準 非推奨;
   55. webkitConvertPointFromPageToNode() 非標準 非推奨;
4. イベント
   1. afterprint
   2. appinstalled
   3. beforeinstallprompt
   4. beforeprint
   5. beforeunload
   6. blur
   7. devicemotion
   8. deviceorientation
   9. deviceorientationabsolute
   10. error
   11. focus
   12. gamepadconnected
   13. gamepaddisconnected
   14. hashchange
   15. languagechange
   16. load
   17. message
   18. messageerror
   19. offline
   20. online
   21. orientationchange 非推奨;
   22. pagehide
   23. pagereveal
   24. pageshow
   25. pageswap
   26. popstate
   27. rejectionhandled
   28. resize
   29. scrollsnapchange Experimental
   30. scrollsnapchanging Experimental
   31. storage
   32. unhandledrejection
   33. unload 非推奨;
   34. vrdisplayactivate 非標準 非推奨;
   35. vrdisplayconnect 非標準 非推奨;
   36. vrdisplaydeactivate 非標準 非推奨;
   37. vrdisplaydisconnect 非標準 非推奨;
   38. vrdisplaypresentchange 非標準 非推奨;
5. 継承
   1. EventTarget

• 概要
• 構文
• 例
• 仕様書

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

• Learn more
• See full compatibility
• Report feedback

ウィンドウにおけるフレーム（<frame> か <iframe> 要素のいずれか）の数を返します。

framesCount = window.length;

• framesCount はフレームの数です。

js

if (window.length) {
  // サブフレーム数が 0 でない場合の処理をここに記述
}

.

This page was last modified on 2025年2月22日 by MDN contributors.

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