質問編集履歴
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コードを書き忘れてました
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File without changes
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body
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@@ -12,4 +12,102 @@
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自分としてはMDNの書き方の方がかなり見やすく感じるのですが、
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15
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windowLoadのイベント無しでbodyにfunctionも無しでscript直打ちしちゃって大丈夫なんでしょうか？？
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15
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windowLoadのイベント無しでbodyにfunctionも無しでscript直打ちしちゃって大丈夫なんでしょうか？？
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MDNのサイトのコードです
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```javascript
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<title>Sample of MDN</title>
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<style>* { padding: 0; margin: 0; }
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canvas { background: #eee; display:
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block; margin: 0 auto; }
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</style>
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</head>
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<body>
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<canvas id="myCanvas" width="480" height="320"></canvas>
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<script>
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var canvas = document.getElementById("myCanvas");
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var ctx = canvas.getContext("2d");
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ctx.beginPath();
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ctx.rect(20, 40, 50, 50);
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ctx.fillStyle = "#FF0000";
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ctx.fill();
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40
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ctx.closePath();
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ctx.beginPath();
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ctx.arc(240, 160, 20, 0, Math.PI*2, false);
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ctx.fillStyle = "green";
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ctx.fill();
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ctx.closePath();
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ctx.beginPath();
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ctx.rect(160, 10, 100, 40);
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ctx.strokeStyle = "rgba(0, 0, 255, 0.5)";
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ctx.stroke();
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ctx.closePath();
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</script>
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</body>
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</html>
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```
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Oreillyを参考にしたwindowLoadを使う書き方です
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```javascript
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>EX2 seriesMDN</title>
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<style>* { padding: 0; margin: 0; }
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canvas { background: #eee; display:
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block; margin: 0 auto; }
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</style>
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<script >
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window.addEventListener('load', eventWindowLoaded, false);
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function eventWindowLoaded() {
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canvasApp();
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}
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function canvasApp() {
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var theCanvas = document.getElementById("canvas");
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var ctx = theCanvas.getContext("2d");
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drawScreen();
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function drawScreen() {
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ctx.beginPath();
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ctx.rect(20, 40, 50, 50);
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ctx.fillStyle = "#FF0000";
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ctx.fill();
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ctx.closePath();
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ctx.beginPath();
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ctx.arc(240, 160, 20, 0, Math.PI*2, false);
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ctx.fillStyle = "green";
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ctx.fill();
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ctx.closePath();
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ctx.beginPath();
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ctx.rect(160, 10, 100, 40);
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ctx.strokeStyle = "rgba(0, 0, 255, 0.5)";
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ctx.stroke();
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ctx.closePath();
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102
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}
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}
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105
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106
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</script>
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</head>
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<body>
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<canvas id="canvas" width="480" height="320">No canvas sup</canvas>
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</body>
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</html>
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```
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