作者：卿篤軍
原文地址：http://blog.csdn.net/qingdujun/article/details/32925369
我們用的最基本的繪圖環境在canvas中繪圖，通過調用canvas對象的getContext()方法來擷取繪圖環境。getContext()方法只需要一個參數：繪圖環境的類型。在遊戲中，我們使用2D類型的繪圖環境。
擷取canvas繪圖環境
<!--<!DOCTYPE> 聲明必須是 HTML 文檔的第一行，位於 <html> 標籤之前。--><!DOCTYPE html><html><head><meta http-equiv="Content-type" content="text/html; charset = utf-8"><title>HTML5</title><script type="text/javascript" charset = "utf-8">//這個函數將在頁面完全載入後調用function pageLoaded(){//擷取canvas對象的引用,注意tCanvas名字必須和下面body裡面的id相同var canvas = document.getElementById('tCanvas');//擷取該canvas的2D繪圖環境var context = canvas.getContext('2d');//繪製代碼將出現在這裡}</script></head><body onload="pageLoaded();"><canvas width = "400" height = "200" id = "tCanvas" style = "border:black 1px solid;"> <!--如果瀏覽器不支援則顯示如下字型-->提示：你的瀏覽器不支援<canvas>標籤</canvas></body></html>參考文獻：(印)香卡(Shankar,A.R.)(作者).謝光磊(譯者).HTML5遊戲開發進階指南[M].北京：電子工業出版社，2013.2-3.
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