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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

CanvasRenderingContext2D .closePath() method of the Canvas 2D API attempts to add a straight line from the current point to the start of the current sub-path. If the shape has already been closed or has only one point, this function does nothing.

This method doesn't draw anything to the canvas directly. You can render the path using the stroke() or fill() 方法。

句法

void ctx.closePath();
					

范例

Closing a triangle

This example creates the first two (diagonal) sides of a triangle using the lineTo() method. After that, the triangle's base is created with the closePath() method, which automatically connects the shape's first and last points.

HTML

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

JavaScript

The triangle's corners are at (20, 150), (120, 20), and (220, 150).

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.beginPath();
ctx.moveTo(20, 140);   // Move pen to bottom-left corner
ctx.lineTo(120, 10);   // Line to top corner
ctx.lineTo(220, 140);  // Line to bottom-right corner
ctx.closePath();       // Line to bottom-left corner
ctx.stroke();
					

结果

Closing just one sub-path

This example draws a smiley face consisting of three disconnected sub-paths.

Note: Although closePath() is called after all the arcs have been created, only the last arc (sub-path) gets closed.

HTML

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

JavaScript

The first two arcs create the face's eyes. The last arc creates the mouth.

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.beginPath();
ctx.arc(240, 20, 40, 0, Math.PI);
ctx.moveTo(100, 20);
ctx.arc(60, 20, 40, 0, Math.PI);
ctx.moveTo(215, 80);
ctx.arc(150, 80, 65, 0, Math.PI);
ctx.closePath();
ctx.lineWidth = 6;
ctx.stroke();
					

结果

规范

规范	状态	注释
HTML 实时标准 The definition of 'CanvasRenderingContext2D.closePath' in that specification.	实时标准

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
closePath	Chrome 1	Edge 12	Firefox 1.5	IE 9	Opera 11.6	Safari 2	WebView Android 1	Chrome Android 18	Firefox Android 4	Opera Android 12	Safari iOS 1	Samsung Internet Android 1.0

图例

完整支持

完整支持

另请参阅

• The interface defining this method: CanvasRenderingContext2D
• CanvasRenderingContext2D.beginPath()

元数据

• 最后修改： Mar 24, 2019

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()