<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset = utf-8">
</head>
<script type="text/javascript" charset="utf-8">
var imageLoader = {
loaded:true,
loadedImages:0,
totalImages:0,
load:function(url){
this.totalImages++;
this.loaded = false;
var image = new Image();
image.src = url;
image.onload = function(){//图片加载后调用的图片
imageLoader.loadedImages++;
if(imageLoader.loadedImages === imageLoader.totalImages){
imageLoader.loaded = true;
}
}
return image;
}
};
function pageLoaded(){
var canvas = document.getElementById(‘testcanvas‘);//得到画布
var context = canvas.getContext(‘2d‘);//得到绘图环境 参数为绘图环境的类型
imageLoader.loaded = false;
var image_gx1 = imageLoader.load(‘/testimg/gx/gx1.png‘);
var image_gx2 = imageLoader.load(‘/testimg/gx/gx2.jpg‘);
var image_gx3 = imageLoader.load(‘/testimg/gx/gx3.jpg‘);
var image_gx4 = imageLoader.load(‘/testimg/gx/gx4.jpg‘);
var interHandler = setInterval(function () {
if(imageLoader.loaded){
context.drawImage(image_gx1,0,0,100,100);
context.drawImage(image_gx2,101,0,100,100);
context.drawImage(image_gx3,201,0,100,100);
context.drawImage(image_gx4,301,0,100,100);
clearInterval(interHandler)
}
},50);
}
</script>
<body onload="pageLoaded();">
<canvas width="1200" height="480" id="testcanvas" style="border: black 1px solid">
</canvas>
</body>
</html>原文地址：http://quietnight.blog.51cto.com/7163892/1912913
