为什么我的图像没有显示在画布上? [英] Why is my image not showing on the canvas?
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问题描述
我正在尝试在左上角的画布上显示图像,并且绘制功能无法正常工作.我做错了什么.
I am trying to show an image on a canvas at the top corner and the draw function is not working properly. What have I done wrong.
上面的图片是我想在屏幕上显示的.
The above image is what I want to show on the screen.
<html>
<head>
<title></title>
</head>
<body>
<p><canvas id="canvas" style="border:1px solid black;" width="450" height="310"></canvas>
</body>
<script>
var c=document.getElementById("canvas");
var ctx=c.getContext("2d");
draw();
function draw(){
var img = new Image();
img.src = "t.gif";
ctx.drawImage(img,0,0);
}
</script>
</html>
推荐答案
问题是您试图在浏览器完成下载之前立即绘制图像.
The problem is that you attempt to draw the image immediately, before the browser has finished downloading it.
尝试以下方法:
function draw(){
var img = new Image();
img.onload = function() {
ctx.drawImage(img,0,0);
};
img.src = "t.gif";
}
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