[英]image does not appear on github pages
我寫了一個簡單的HTML文件,將圖像放在畫布上。 它在localhost上運行,但不在github頁面上運行。
圖像starry-night.jpg
位於同一文件夾中。
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<canvas id="vincent"></canvas>
<script>
var width = 960;
var height = 500;
var canvas = document.getElementById('vincent');
var ctx = canvas.getContext("2d");
canvas.width = width;
canvas.height = height;
var image = new Image();
image.src= "starry-night.jpg";
ctx.drawImage(image, 0, 0);
console.log("done");
</script>
</body>
這是一個不起作用的鏈接: http : //monsieurcactus.github.io/LearnElm/canvas-example.html
這是一個不起作用的代碼段:
var width = 960; var height = 500; var canvas = document.getElementById('vincent'); var ctx = canvas.getContext("2d"); canvas.width = width; canvas.height = height; var image = new Image(); image.src= "http://monsieurcactus.github.io/LearnElm/starry-night.jpg"; ctx.drawImage(image, 0, 0); console.log("done");
<canvas id="vincent"></canvas>
使用src屬性設置圖像的來源會使瀏覽器觸發HTTP請求以獲取圖像 ,並且您需要等待圖像加載后才能繪制圖像 。 像這樣:
<!DOCTYPE html> <meta charset="utf-8"> <body> <canvas id="vincent"></canvas> <script> var width = 960; var height = 500; var canvas = document.getElementById('vincent'); var ctx = canvas.getContext("2d"); canvas.width = width; canvas.height = height; var image = new Image(); image.src= "http://monsieurcactus.github.io/LearnElm/starry-night.jpg"; image.onload = function() { ctx.drawImage(image, 0, 0); console.log("done"); } </script> </body>
注意:這里我們需要一個絕對URL,因為該示例是在monsieurcactus.github.io/LearnElm/之外提供的
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