Javascript 画布drawImage不工作
这幅画画不到画布上。它正在加载,当body.appendChild(img)时我看到它;被称为。有人知道为什么它不在画布上显示吗?我正在遵循udacity上html5课程的代码示例。谢谢你的帮助Javascript 画布drawImage不工作,javascript,html,canvas,Javascript,Html,Canvas,这幅画画不到画布上。它正在加载,当body.appendChild(img)时我看到它;被称为。有人知道为什么它不在画布上显示吗?我正在遵循udacity上html5课程的代码示例。谢谢你的帮助 <!DOCTYPE html> <html> <head> <title>First Game</title> <meta http-equiv="Content-T
<!DOCTYPE html>
<html>
<head>
<title>First Game</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link type="text/css" rel="stylesheet" href="TestCanvasCSS.css"/>
</head>
<body id="body">
<script>
var canvas;
var ctx = null;
var img = null;
var body = null;
setup = function() {
body = document.getElementById("body");
canvas = document.createElement("canvas");
ctx = canvas.getContext('2d');
//canvas.setAttribute("class","canvasMain");
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
body.appendChild(canvas);
img = new Image();
img.onload = onImageLoad();
img.src = 'http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg';
};
onImageLoad = function() {
console.log("Image has loaded");
body.appendChild(img);
ctx.drawImage(img, 0, 0);
};
setup();
</script>
<!-- <script type="text/javascript" src="TestCanvas.js"> </script> -->
</body>
</html>
第一局
var帆布;
var-ctx=null;
var-img=null;
var body=null;
设置=函数(){
body=document.getElementById(“body”);
canvas=document.createElement(“canvas”);
ctx=canvas.getContext('2d');
//setAttribute(“类”、“canvasMain”);
canvas.width=window.innerWidth;
canvas.height=window.innerHeight;
body.appendChild(画布);
img=新图像();
img.onload=onImageLoad();
img.src=http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg';
};
onImageLoad=函数(){
log(“图像已加载”);
附肢儿童(img);
ctx.drawImage(img,0,0);
};
设置();
不
onImageLoad()代码>如果包含括号,则执行的是函数就是这么简单!非常感谢。
img.onload = onImageLoad;