From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- .../api/canvasrenderingcontext2d/canvas/index.html | 57 ++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 files/zh-cn/web/api/canvasrenderingcontext2d/canvas/index.html (limited to 'files/zh-cn/web/api/canvasrenderingcontext2d/canvas') diff --git a/files/zh-cn/web/api/canvasrenderingcontext2d/canvas/index.html b/files/zh-cn/web/api/canvasrenderingcontext2d/canvas/index.html new file mode 100644 index 0000000000..63331f1630 --- /dev/null +++ b/files/zh-cn/web/api/canvasrenderingcontext2d/canvas/index.html @@ -0,0 +1,57 @@ +--- +title: CanvasRenderingContext2D.canvas +slug: Web/API/CanvasRenderingContext2D/canvas +tags: + - API + - Canvas +translation_of: Web/API/CanvasRenderingContext2D/canvas +--- +
{{APIRef}}
+ +

CanvasRenderingContext2D.canvas 属性是 Canvas API 的一部分,是对与给定上下文关联的{{domxref("HTMLCanvasElement")}}对象的只读引用。如果没有 {{HTMLElement("canvas")}} 元素与之对应,对象值为{{jsxref("null")}} 。

+ +

语法

+ +
ctx.canvas;
+ +

示例

+ +

给出 {{HTMLElement("canvas")}} 元素:

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

你可以通过CanvasRenderingContext2D调用内部的canvas属性,获取canvas的一个反向引用:

+ +
var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+ctx.canvas // HTMLCanvasElement
+
+ +

规范描述

+ + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-canvas", "CanvasRenderingContext2D.canvas")}}{{Spec2('HTML WHATWG')}} 
+ +

浏览器兼容性

+ +

{{Compat("api.CanvasRenderingContext2D.canvas")}}

+ +

参见

+ + -- cgit v1.2.3-54-g00ecf