JavaScript：Canvas.drawImage不顯示任何圖像

Question

我寫了這個簡單的html代碼...

<!DOCTYPE html>
<html>
<head>
    <title>Doc</title>
</head>
<body>
<canvas id = 'myCanvas' width = '800' height = '560'>Ah Snap!</canvas>
<script>
    var canvas = document.getElementById('myCanvas');
    var context = canvas.getContext('2d');

    var img = new Image();
    img.src = 'E:\HTMLPaint1\image123.jpg';

    img.onload = function() {
        context.drawImage(img, 278, 117, 200, 200);
    }

</script>
</body>
</html>

運行后，它不會顯示任何圖像！ （路徑正確）

Answer 1

我在這里舉了一個例子：

window.onload = function(){

       var canvas = document.getElementById("myCanvas");
       var context = canvas.getContext("2d"); 
       var imageObj = new Image();

       imageObj.onload = function(){
                  var destX = canvas.width / 2 - this.width / 2;
                  var destY = canvas.height / 2 - this.height / 2;
                  context.drawImage(this, destX, destY); 
        };
     imageObj.src = "http://lh3.ggpht.com/YOsk5uW00GWrypKD_2PmGz1sGjsLZs4TMtUWUgX5RCTufXhO_HbpCjJz23K-m0KJX8QQv3ihghMhBFuB2I6nO6GXslhfR3GtTw2HQMYvYw";

};

JavaScript：Canvas.drawImage不顯示任何圖像

問題描述

1 個解決方案

解決方案1
0 已采納 2013-10-29 19:25:51

JavaScript：Canvas.drawImage不顯示任何圖像

問題描述

1 個解決方案

解決方案1 0 已采納 2013-10-29 19:25:51

解決方案1
0 已采納 2013-10-29 19:25:51