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="https://www.jb51.net/demo.js"></script> </head> <body> <canvas hight="400" > <span>你的浏览器不支持canvas</span> </canvas> </body> </html>
图片：
效果：
