harmony 鸿蒙Accessibility

  • 2025-06-12
  • 浏览 (3)

Accessibility

You can set accessibility attributes and events for components.

NOTE

The APIs of this module are supported since API version 10. Updates will be marked with a superscript to indicate their earliest API version.

accessibilityGroup

accessibilityGroup(value: boolean)

Sets whether to enable accessibility grouping. When accessibility grouping is enabled, the component and all its children are treated as a single selectable unit, and the accessibility service will no longer focus on the individual child components.

If accessibility grouping is enabled and the component does not contain a universal text attribute or an accessibility text attribute, the system will concatenate the universal text attributes of its child components to form a merged text for the component. If a child component lacks a universal text attribute, it will be ignored in the concatenation process. The merged text will not use the accessibility text of the child components.

Widget capability: This API can be used in ArkTS widgets since API version 12.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value boolean Yes Whether to enable accessibility grouping. When accessibility grouping is enabled, the component and all its children are treated as a single selectable unit, and the accessibility service will no longer focus on the individual child components.
Default value: false

accessibilityGroup14+

accessibilityGroup(isGroup: boolean, accessibilityOptions: AccessibilityOptions)

Sets whether to enable accessibility grouping, with support for prioritizing the concatenation of accessibility text for accessibility announcement. When accessibility grouping is enabled, the component and all its children are treated as a single selectable entity, and the accessibility service will no longer focus on the individual child components.

If accessibility grouping is enabled and the component does not contain a universal text attribute or an accessibility text attribute, the system will concatenate the universal text attributes of its child components to form a merged text for the component. If a child component lacks a universal text attribute, it will be ignored in the concatenation process.

When accessibilityPreferred is set to true, the system will prioritize concatenating the accessibility text attributes of the child components to form the merged text. If a child component lacks an accessibility text attribute, the system will continue to concatenate its universal text attribute. If a child component lacks both, it will be ignored.

Widget capability: This API can be used in ArkTS widgets since API version 14.

Atomic service API: This API can be used in atomic services since API version 14.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
isGroup boolean Yes Whether to enable accessibility grouping. When accessibility grouping is enabled, the component and all its children are treated as a single selectable unit, and the accessibility service will no longer focus on the individual child components.
Default value: false
accessibilityOptions AccessibilityOptions Yes Options for accessibility grouping. When accessibilityPreferred is set to true, the system will prioritize concatenating the accessibility text attributes of the child components to form the merged text.
Default value: false

AccessibilityOptions14+

System capability: SystemCapability.ArkUI.ArkUI.Full

Name Type Mandatory Description
accessibilityPreferred boolean No Whether to prioritize the accessibility text of child components during a deep traversal. The value true means to prioritize the accessibility text of child components.
If a child component’s accessibility text is empty, the accessibility service uses the component’s own text content. The concatenated text is then assigned to the parent node if both its accessibility text and text content are empty.
Default value: false

accessibilityText

accessibilityText(value: string)

Sets the accessibility text. When a component does not contain a text attribute, you can use this API to set an accessibility text attribute, so that accessibility services can announce the specified content for the component.

Widget capability: This API can be used in ArkTS widgets since API version 12.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value string Yes Accessibility text. If a component does not contain text information, it will not be announced by the screen reader when selected. In this case, the screen reader user cannot know which component is selected. To solve this problem, you can set accessibility text for components without text information. When such a component is selected, the screen reader announces the specified accessibility text, informing the user which component is selected.
Default value: ””
NOTE
If a component has both text content and accessibility text, only the accessibility text is announced.
If a component is grouped for accessibility purposes but lacks both text content and accessibility text, the screen reader will concatenate text from its child components (depth-first traversal).
To prioritize accessibility text concatenation, set accessibilityPreferred in accessibilityGroup.

accessibilityText12+

accessibilityText(text: Resource)

Sets the accessibility text, with support for resource references using Resource. When a component does not contain a text attribute, you can use this API to set an accessibility text attribute, so that accessibility services can announce the specified content for the component.

Widget capability: This API can be used in ArkTS widgets since API version 12.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
text Resource Yes Reference resource of accessibility text. If a component does not contain text information, it will not be announced by the screen reader when selected. In this case, the screen reader user cannot know which component is selected. To solve this problem, you can set accessibility text for components without text information. When such a component is selected, the screen reader announces the specified accessibility text, informing the user which component is selected.
NOTE
If a component has both text content and accessibility text, only the accessibility text is announced.
If a component is grouped for accessibility purposes but lacks both text content and accessibility text, the screen reader will concatenate text from its child components (depth-first traversal).
To prioritize accessibility text concatenation, set accessibilityPreferred in accessibilityGroup.

accessibilityDescription

accessibilityDescription(value: string)

Sets the accessibility description. This property provides additional context or explanation for the component, helping users understand the action or function it performs.

Widget capability: This API can be used in ArkTS widgets since API version 12.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value string Yes Accessibility description. You can specify further explanation of the current component, for example, possible operation consequences, especially those that cannot be learned from component attributes and accessibility text. If a component contains both text information and the accessibility description, the text is read first and then the accessibility description, when the component is selected.
Default value: ””

accessibilityDescription12+

accessibilityDescription(description: Resource)

Sets the accessibility description, with support for resource references using Resource. This property provides additional context or explanation for the component, helping users understand the action or function it performs.

Widget capability: This API can be used in ArkTS widgets since API version 12.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
description Resource Yes Reference resource of the accessibility description. You can specify further explanation of the current component, for example, possible operation consequences, especially those that cannot be learned from component attributes and accessibility text. If a component contains both text information and the accessibility description, the text is read first and then the accessibility description, when the component is selected.

accessibilityLevel

accessibilityLevel(value: string)

Sets the accessibility level. This property determines whether the component can be recognized by accessibility services.

Widget capability: This API can be used in ArkTS widgets since API version 12.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value string Yes Accessibility level, which is used to decide whether a component can be identified by the accessibility service.
The options are as follows:
“auto”: The component’s recognizability is determined by the accessibility grouping service and ArkUI.
“yes”: The component can be recognized by accessibility services.
“no”: The component cannot be recognized by accessibility services.
“no-hide-descendants”: Neither the component nor its child components can be recognized by accessibility services.
Default value: “auto”
NOTE
When accessibilityLevel is set to “auto”, the component’s recognizability depends on the following factors:
1. The accessibility service internally determines whether the component can be recognized.
2. If the parent component’s accessibilityGroup property has isGroup set to true, the accessibility service will not focus on its child components, making them unrecognizable.
3. If the parent component’s accessibilityLevel is set to “no-hide-descendants”, the component will not be recognized by accessibility services.

accessibilityVirtualNode11+

accessibilityVirtualNode(builder: CustomBuilder)

Sets an accessibility virtual child node. For custom drawing components, a CustomBuilder is passed, which is used to provide accessibility information. The components within the CustomBuilder are only used for layout and not for display. When the accessibility service obtains node information, it returns the node information from the CustomBuilder.

Widget capability: This API can be used in ArkTS widgets since API version 12.

Atomic service API: This API can be used in atomic services since API version 11.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
builder CustomBuilder Yes Accessibility virtual node, which enables you to pass in a custom builder to the self-drawing component. The components in the custom builder are only laid out but not displayed at the backend. When the accessibility application obtains the accessibility node information, the node information in the custom builder is returned.

accessibilityChecked13+

accessibilityChecked(isCheck: boolean)

Sets the checked state of the accessibility component. This property is used in multiselect scenarios.

Widget capability: This API can be used in ArkTS widgets since API version 13.

Atomic service API: This API can be used in atomic services since API version 13.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
isCheck boolean Yes Whether the current component is selected.
The options are as follows:
true: The component is selected.
false: The component is not selected.
undefined: The component determines its own selected state.
Default value: undefined.
NOTE
1. Setting this parameter to true or false will automatically set the component’s checkable attribute to true.
2. When this parameter is set to true or false, to use it with accessibilitySelected, set the accessibilitySelected parameter to undefined.

accessibilitySelected13+

accessibilitySelected(isSelect: boolean)

Sets the selected state of the accessibility component. This property is used in single-select scenarios.

Widget capability: This API can be used in ArkTS widgets since API version 13.

Atomic service API: This API can be used in atomic services since API version 13.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
isSelect boolean Yes Whether the current component is selected.
The options are as follows:
true: The component is selected.
false: The component is not selected.
undefined: The component determines its own selected state.
Default value: undefined.
NOTE
1. When this parameter is set to true or false, to use it with accessibilityChecked, set the accessibilityChecked parameter to undefined.

accessibilityRole18+

accessibilityRole(role: AccessibilityRoleType)

Sets the role type of the accessibility component, which affects how the component is announced by screen readers.

Widget capability: This API can be used in ArkTS widgets since API version 18.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
role AccessibilityRoleType Yes Role of the component as announced by screen readers (for example, button or chart). You can define custom roles.

onAccessibilityFocus18+

onAccessibilityFocus(callback: AccessibilityFocusCallback)

Triggered when the accessibility component gains or loses focus. Callback triggered when the component gains or loses focus.

Widget capability: This API can be used in ArkTS widgets since API version 18.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
callback AccessibilityFocusCallback Yes Callback that notifies the registered component of focus and blur events.

AccessibilityFocusCallback18+

type AccessibilityFocusCallback = (isFocus: boolean) => void

Defines the callback type used in onAccessibilityFocus.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
isFocus boolean Yes Whether the component has gained or lost focus.

AccessibilityRoleType18+

Enumerates the component role types used by screen readers.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Name Value Description
ACTION_SHEET 0 Action sheet.
ALERT_DIALOG 1 Alert dialog box.
INDEXER_COMPONENT 2 Indexer component.
BADGE_COMPONENT 3 Badge component.
BLANK 4 Blank placeholder component.
BUTTON 5 Button.
BACK_BUTTON 6 Back button on a large image page.
SHEET_DRAG_BAR 7 Drag bar for sheets.
CALENDAR_PICKER 8 Calendar picker.
CALENDAR 9 Calendar.
CANVAS 10 Canvas component.
CANVAS_GRADIENT 11 Gradient object.
CANVAS_PATTERN 12 Pattern for image filling based on a specified source image and repetition mode.
CHECKBOX 13 Check box component.
CHECKBOX_GROUP 14 Check box group.
CIRCLE 15 Component for drawing circles.
COLUMN_SPLIT 16 Vertical layout of child components with horizontal dividers.
COLUMN 17 Container that lays out child components vertically.
CANVAS_RENDERING_CONTEXT_2D 18 2D drawing object, which can be used to draw rectangles, images, and texts on the canvas component.
CHART 19 Chart component.
COUNTER 20 Counter component.
CONTAINER_MODAL 21 Modal container.
DATA_PANEL 22 Data panel component.
DATE_PICKER 23 Date picker.
DIALOG 24 Dialog box.
DIVIDER 25 Divider component.
DRAG_BAR 26 Drag bar.
EFFECT_COMPONENT 27 Container component for special effects.
ELLIPSE 28 Ellipse drawing component.
FLEX 29 Container that allows for flexible layout of child components.
FLOW_ITEM 30 Child component of a waterfall layout container.
FORM_COMPONENT 31 Widget component.
FORM_LINK 32 Static widget interaction component.
GAUGE 33 Gauge component.
GRID 34 Grid container.
GRID_COL 35 Grid column component.
GRID_CONTAINER 36 Grid container that lays out child components vertically.
GRID_ITEM 37 Single-item container within a grid container.
GRID_ROW 38 Grid row component.
HYPERLINK 39 Hyperlink component.
IMAGE 40 Image component
IMAGE_ANIMATOR 41 Frame animation component.
IMAGE_BITMAP 42 Pixel data for canvas rendering.
IMAGE_DATA 43 Pixel data for canvas rendering.
IMAGE_SPAN 44 Component used to display inline images.
LABEL 45 Label.
LINE 46 Line.
LIST 47 List.
LIST_ITEM 48 Specific item in a list.
LIST_ITEM_GROUP 49 List item group.
LOADING_PROGRESS 50 Component for display loading animations.
MARQUEE 51 Marquee component.
MATRIX2D 52 2D matrix object.
MENU 53 Menu.
MENU_ITEM 54 Menu item.
MENU_ITEM_GROUP 55 Menu item group.
NAV_DESTINATION 56 Content area of the Navigation component.
NAV_ROUTER 57 Navigation component.
NAVIGATION 58 Root view container for navigation routing.
NAVIGATION_BAR 59 Navigation bar.
NAVIGATION_MENU 60 Navigation menu.
NAVIGATOR 61 Navigation container component.
OFFSCREEN_CANVAS 62 Canvas for custom drawing of graphics.
OFFSCREEN_CANVAS_RENDERING_CONTEXT2D 63 2D drawing object, which can be used to draw rectangles, images, and texts on a canvas component.
OPTION 64 Specific item.
PANEL 65 Slidable panel.
PAPER_PAGE 66 Page.
PATH 67 Path drawing component.
PATH2D 68 Path object.
PATTERN_LOCK 69 Pattern lock component.
PICKER 70 Picker.
PICKER_VIEW 71 Picker view.
PLUGIN_COMPONENT 72 Plugin component.
POLYGON 73 Component used to draw a polygon.
POLYLINE 74 Component used to draw a polyline.
POPUP 75 Popup with a specific style.
PROGRESS 76 Text download button.
QRCODE 77 QR code.
RADIO 78 Radio button.
RATING 79 Component for selecting a rating within a given range.
RECT 80 Component used to draw a rectangle.
REFRESH 81 Pull-to-refresh container component.
RELATIVE_CONTAINER 82 Relative layout component.
REMOTE_WINDOW 83 Remote control window component.
RICH_EDITOR 84 Component that supports rich text editing and interactive text editing.
RICH_TEXT 85 Rich text component.
ROLE_PAGER 86 Pagination component.
ROW 87 Container that lays out child components horizontally.
ROW_SPLIT 88 Horizontal layout of child components with vertical dividers.
SCROLL 89 Scrollable container component.
SCROLL_BAR 90 Scrollbar.
SEARCH 91 Search box component.
SEARCH_FIELD 92 Search box.
SELECT 93 Drop-down list component.
SHAPE 94 Parent component of the drawing components.
SIDEBAR_CONTAINER 95 Sidebar container that can show and hide the sidebar.
SLIDER 96 Vertical slider.
SPAN 97 Component used to display inline text.
STACK 98 Stack container.
STEPPER 99 Stepper component.
STEPPER_ITEM 100 Page child component of the stepper component.
SWIPER 101 Swiper view container.
SWIPER_INDICATOR 102 Navigation indicator for the Swiper component.
SWITCH 103 Switch.
SYMBOL_GLYPH 104 Component for displaying a symbol glyph.
TAB_CONTENT 105 Content view for a tab in the Tabs component.
TAB_BAR 106 Tab bar.
TABS 107 Container that allows users to switch between content views through tabs.
TEXT 108 Text.
TEXT_CLOCK 109 Text clock component.
TEXT_ENTRY 110 Text input.
TEXT_INPUT 111 Text box component.
TEXT_PICKER 112 Text picker.
TEXT_TIMER 113 Component that displays timing information and is controlled in text format.
TEXT_AREA 114 Text area component.
TEXT_FIELD 115 Text box.
TIME_PICKER 116 Time picker.
TITLE_BAR 117 Title bar.
TOGGLER 118 Status component.
UI_EXTENSION_COMPONENT 119 UI extension component.
VIDEO 120 Component for playing video files and controlling playback.
WATER_FLOW 121 Waterfall layout container.
WEB 122 Component for loading web pages.
XCOMPONENT 123 Custom rendering component.
ROLE_NONE 124 Null.

accessibilityNextFocusId18+

accessibilityNextFocusId(nextId: string)

Sets the next focus target for the component during focus traversal.

Widget capability: This API can be used in ArkTS widgets since API version 18.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
nextId string Yes Unique ID of the next component to receive focus. If the ID does not correspond to any component, the setting is invalid.

accessibilityDefaultFocus18+

accessibilityDefaultFocus(focus: boolean)

Sets whether the component is the default initial focus for screen readers on the current page.

Widget capability: This API can be used in ArkTS widgets since API version 18.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
focus boolean Yes Whether the component is the default initial focus for screen readers on the current page. The value true means the component is the default initial focus for screen readers on the current page. Other values are invalid.

accessibilityUseSamePage18+

accessibilityUseSamePage(pageMode: AccessibilitySamePageMode)

Solves focus jumping issues in sub-tree scenarios like UIExtensionComponent. Sets the same-page mode for this UIExtensionComponent and the host application. This property is intended to solve focus jumping issues in sub-tree scenarios. Due to the timing of page events sent by the UIExtensionComponent and the host application, focus may jump from one component to another, causing “focus jumping.”

Widget capability: This API can be used in ArkTS widgets since API version 18.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
pageMode AccessibilitySamePageMode Yes Same-page mode for the current UIExtensionComponent and the host application.

AccessibilitySamePageMode18+

Enumerates the same-page modes for the current UIExtensionComponent and the host application.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Name Value Description
SEMI_SILENT 0 Ignores page events if it is the first page load or if the root node of the page sends the page event.
FULL_SILENT 1 Ignores all page events in the UIExtensionComponent.

accessibilityScrollTriggerable18+

accessibilityScrollTriggerable(isTriggerable: boolean)

Sets whether to enable automatic scrolling for screen readers when the current page has no focusable components.

Widget capability: This API can be used in ArkTS widgets since API version 18.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
isTriggerable boolean Yes Whether the component supports automatic scrolling for screen readers when the current page has no focusable components.
The options are as follows:
true: The component triggers automatic scrolling for screen readers when the current page has no focusable components.
false: The component does not trigger automatic scrolling for screen readers when the current page has no focusable components.
undefined: The default settings are restored.
Default value: true
NOTE
1. This parameter does not affect the original scrollable attribute of the component.
2. The final scrolling behavior is determined by the screen reader based on this parameter and whether the component supports scrolling.
3. This API applies to all basic components. It is recommended for scrollable components, including List, Grid, Scroll, and WaterFlow.

accessibilityTextHint12+

accessibilityTextHint(value: string)

Sets the text hint for the component, which can be queried by accessibility services.

Widget capability: This API can be used in ArkTS widgets since API version 12.

Atomic service API: This API can be used in atomic services since API version 12.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
value string Yes Text hint for the component, which can be queried by accessibility services.

accessibilityFocusDrawLevel18+

accessibilityFocusDrawLevel(drawLevel: FocusDrawLevel)

Sets the drawing level for the accessibility focus highlight (green box) to ensure it is visible and not obscured by other components. > NOTE > > 1. By default, the accessibility focus highlight (green box) is drawn at the same level as the focused component. This can sometimes result in the highlight being obscured or clipped by parent components or siblings with higher z-order. > > 2. Setting the drawing level to the topmost layer ensures that the accessibility focus highlight is not obscured by other components. This is useful when you want the highlight to be clearly visible at all times. However, this setting may not be suitable if you need to interact with components that should overlay the currently focused component and you do not want the accessibility highlight to be visible.

Widget capability: This API can be used in ArkTS widgets since API version 18.

Atomic service API: This API can be used in atomic services since API version 18.

System capability: SystemCapability.ArkUI.ArkUI.Full

Parameters

Name Type Mandatory Description
drawLevel FocusDrawLevel Yes Drawing level for the accessibility focus highlight.

Example 1: Setting Accessibility Text and Description

This example demonstrates how to use accessibilityText and accessibilityDescription to customize the content announced by screen readers.

// xxx.ets
@Entry
@Component
struct Index {

  @Builder customAccessibilityNode() {
    Column() {
      Text(`virtual node`)
    }
    .width(10)
    .height(10)
  }

  build() {
    Row() {
      Column() {
        Text("Text 1")
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
        Text("Text 2")
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
      }
      .width('100%')
      .accessibilityGroup(true)
      .accessibilityLevel("yes")
      .accessibilityText("Group") // If a component has both text content and accessibility text, only the accessibility text is announced.
      .accessibilityDescription("The Column component is selectable , and the text to be read out is "Group".)
      .accessibilityVirtualNode(this.customAccessibilityNode)
      .accessibilityChecked(true)
      .accessibilitySelected(undefined)
    }
    .height('100%')
  }
}

Example 2: Setting the Accessibility Group

This example shows how to use accessibilityGroup to prioritize reading the accessibility text of child components.

// xxx.ets
@Entry
@Component
struct Focus {
  build() {
    Column({ space: 10 }) {
      Text('123456')
        .focusable(true)
        .borderRadius(5)
        .accessibilityText("Accessibility text is announced if both accessibility text and text content are present")
        .accessibilityLevel("yes")
      Button().accessibilityLevel("yes").accessibilityText("Accessibility text is announced if no text is present")
      Button("Text content is announced if no accessibility text is present").accessibilityLevel("yes")
      Button()
      Button('btnl23').accessibilityText("Button with both accessibility text and text").accessibilityLevel("yes")
      Button('btn123').accessibilityLevel("yes")
    }
    .accessibilityGroup(true, { accessibilityPreferred: true })
    //.accessibilityGroup(true)
    .borderWidth(5)
    .width('100%')
    .height('100%')
  }
}

你可能感兴趣的鸿蒙文章

harmony 鸿蒙ArcButton

harmony 鸿蒙ArcSlider

harmony 鸿蒙Chip

harmony 鸿蒙ChipGroup

harmony 鸿蒙ComposeListItem

harmony 鸿蒙ComposeTitleBar

harmony 鸿蒙advanced.Counter

harmony 鸿蒙Dialog Box (Dialog)

harmony 鸿蒙DialogV2

harmony 鸿蒙DownloadFileButton

0  赞
  • 所属分类： 后端技术
  • 本文标签：
  • 版权声明： 原创文章如转载，请注明本文链接: https://m.seaxiang.com/blog/A1WItF
热门推荐
标签云
Linux Java Spring Spring Boot docker 大数据 前端 生活 maven golang 软件 spring cloud fintech mac vscode 其他 区块链 以太坊 V神 开发者 技术 股票 git greenplum 分布式事务 chrome mysql flink kafka 设计模式 原理 鸿蒙 seo
最新文章
本文目录