CanvasgetContext
要取得此實作此介面的實體物件，可以於一個 canvas 元素上以 "2d" 為參數呼叫 getContext() 方法：,The HTML <canvas> tag is used to draw graphics, on the fly, via scripting (usually JavaScript). To learn ... save(), Saves the state of the current context. restore ...
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 CanvasgetContext 相關參考資料
Canvas 基本用途- Web APIs | MDN
跳到 渲染環境(rendering context) - 渲染環境(rendering context). <canvas> 產生一個固定大小的繪圖畫布，這個畫布上有一或多個渲染環境(rendering ... https://developer.mozilla.org CanvasRenderingContext2D - Web APIs | MDN
要取得此實作此介面的實體物件，可以於一個 canvas 元素上以 "2d" 為參數呼叫 getContext() 方法： https://developer.mozilla.org HTML Canvas Reference - W3Schools
The HTML <canvas> tag is used to draw graphics, on the fly, via scripting (usually JavaScript). To learn ... save(), Saves the state of the current context. restore ... https://www.w3schools.com HTMLCanvasElement.getContext() - Web API Interfaces | MDN
The HTMLCanvasElement.getContext() method returns a drawing context on the canvas, or null if the context identifier is not supported. https://developer.mozilla.org HTMLCanvasElement.getContext() - Web API 接口参考| MDN
HTMLCanvasElement.getContext() 方法返回canvas 的上下文，如果上下文没有定义则返回null . https://developer.mozilla.org HTMLCanvasElement.getContext() - Web APIs | MDN
The HTMLCanvasElement.getContext() method returns a drawing context on the canvas, or null if the context identifier is not supported. https://developer.mozilla.org [HTML5試試看-9] canvas 與2d context - iT 邦幫忙::一起幫忙 ...
另外，不使用getContext來取得context，就沒有方法繪圖了。 還是循例寫一個最簡單的canvas，只畫一條線： <canvas id="canvas" width="100" height ... https://ithelp.ithome.com.tw 試試看Canvas | 卡斯伯Blog - 前端，沒有極限
var ctx = canvas.getContext('2d'); //宣告ctx渲染方式 draw(); //執行draw function }else alert('your browser not support canvas') //如果不支援 }; https://wcc723.github.io 請參考Canvas API - MDN Web Docs - Mozilla
JavaScript. var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); ctx.fillStyle = "green"; ctx.fillRect(10, 10, 100, ... https://developer.mozilla.org 變形效果- Web APIs | MDN
本例會畫一連串矩形圖案來說明畫布狀態堆疊是如何運作。 function draw() var ctx = document.getElementById('canvas').getContext('2d'); ctx. https://developer.mozilla.org |