<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>图像缩放</title><script src="js/modernizr.js"></script></head><body><script type="text/javascript">window.addEventListener('load',eventWindowLoaded,false);function eventWindowLoaded(){ canvasApp();}function canvasSupport(){ return Modernizr.canvas;}function canvasApp(){ if(!canvasSupport()){ return; }else{ var theCanvas = document.getElementById('canvas') var context = theCanvas.getContext("2d") } drawScreen(); function drawScreen(){ context.setTransform(1,0,0,1,0,0); var x = 100; var y = 100; var width = 50; var height = 50; context.translate(x+.5*width,y+.5*height); context.scale(2,2);//横，纵 context.fillStyle="red"; context.fillRect(-.5*width,-.5*height,width,height); } }</script><canvas id="canvas" width="500" height="500">你的浏览器无法使用canvas小白童鞋；你的支持是我最大的快乐！！</canvas></body></html>
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