demo.js
window.onload=function() {
createcanvas();
drawImage();
}
function createcanvas() {
var CANVAS=document.getElementById('mycanvas');
context=CANVAS.getContext('2d');
}
function drawImage() {
var img=new Image();
img.onload=function() {
context.drawImage(img,0,0,200,200 );
}
img.src="img5.jpg";
}
demo.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>canvas</title> <script type="text/javascript" src="demo.js"></script>
</head>
<body>
<canvas id="mycanvas" width="400" hight="400" >
<span>你的浏览器不支持canvas</span>
</canvas> </body>
</html>
图片：
效果：
2017-09-08 08:09:02