WebGL 入門- Web APIs | MDNWebGL 讓網頁內容能藉由一種基於 OpenGL ES 2.0 的API 的幫助，於支援此API ... 在下面的JavaScript 程式碼，當指令完成讀取後會執行 main() 函式。

... 當WebGL 有效才繼續執行 if (gl === null) { alert("無法初始化WebGL，您的瀏覽器不支援。

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