在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

过时
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

CanvasRenderingContext2D 方法 clearHitRegions() removes all hit regions from the canvas.

句法

void ctx.clearHitRegions();
					

范例

使用 clearHitRegions 方法

此范例演示 clearHitRegions() 方法。

HTML

<canvas id="canvas"></canvas>
					

JavaScript

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
// Set some hit regions
ctx.addHitRegion({id: 'eyes'});
ctx.addHitRegion({id: 'nose'});
ctx.addHitRegion({id: 'mouth'});
// Remove them altogether from the canvas
ctx.clearHitRegions();
					

规范

Canvas hit regions have been removed from the WHATWG Living Standard, although discussions about future standardization are ongoing. See https://github.com/whatwg/html/issues/3407 了解更多信息。

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
clearHitRegions 弃用 非标	Chrome Yes Disabled Yes Disabled Disabled This feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.	Edge ≤79 Disabled ≤79 Disabled Disabled From version ≤79: this feature is behind the Experimental Web Platform Features preference.	Firefox 38 Disabled 38 Disabled Disabled From version 38: this feature is behind the canvas.hitregions.enabled preference. To change preferences in Firefox, visit about:config.	IE No	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android 38 Disabled 38 Disabled Disabled From version 38: this feature is behind the canvas.hitregions.enabled preference. To change preferences in Firefox, visit about:config.	Opera Android No	Safari iOS No	Samsung Internet Android No

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

非标。预期跨浏览器支持较差。

非标。预期跨浏览器支持较差。

弃用。不要用于新网站。

弃用。不要用于新网站。

用户必须明确启用此特征。

用户必须明确启用此特征。

另请参阅

• CanvasRenderingContext2D.addHitRegion()
• CanvasRenderingContext2D.removeHitRegion()

元数据

• 最后修改： Jan 3, 2020

相关话题

1. CanvasRenderingContext2D
2. 特性

   1. canvas
   2. currentTransform
   3. direction
   4. fillStyle
   5. filter
   6. font
   7. globalAlpha
   8. globalCompositeOperation
   9. imageSmoothingEnabled
   10. imageSmoothingQuality
   11. lineCap
   12. lineDashOffset
   13. lineJoin
   14. lineWidth
   15. miterLimit
   16. shadowBlur
   17. shadowColor
   18. shadowOffsetX
   19. shadowOffsetY
   20. strokeStyle
   21. textAlign
   22. textBaseline
3. 方法

   1. addHitRegion()
   2. arc()
   3. arcTo()
   4. beginPath()
   5. bezierCurveTo()
   6. clearHitRegions()
   7. clearRect()
   8. clip()
   9. closePath()
   10. createImageData()
   11. createLinearGradient()
   12. createPattern()
   13. createRadialGradient()
   14. drawFocusIfNeeded()
   15. drawImage()
   16. drawWidgetAsOnScreen()
   17. drawWindow()
   18. ellipse()
   19. fill()
   20. fillRect()
   21. fillText()
   22. getImageData()
   23. getLineDash()
   24. getTransform()
   25. isPointInPath()
   26. isPointInStroke()
   27. lineTo()
   28. measureText()
   29. moveTo()
   30. putImageData()
   31. quadraticCurveTo()
   32. rect()
   33. removeHitRegion()
   34. resetTransform()
   35. restore()
   36. rotate()
   37. save()
   38. scale()
   39. scrollPathIntoView()
   40. setLineDash()
   41. setTransform()
   42. stroke()
   43. strokeRect()
   44. strokeText()
   45. transform()
   46. translate()