本示例使用HTML5 canvas，简单的编写了装载图片效果， 请使用支持HTML5的浏览器预览效果：
下图为以逐渐横向栅格的效果图
html部分：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>html5 装载图片</title>
</head>
<body>
<button onclick="drawImg1()">从左到右</button>
<button onclick="drawImg2()">从*到左右两边</button>
<button onclick="drawImg3()">以逐渐横向栅格</button>
<hr/>
<canvas class="canvas" id="canvas" width="600" height="300"></canvas>
</body>
</html>
JavaScript部分：
//初始化
var canvas = document.getElementById("canvas"),
context = canvas.getContext("2d"),
image = new Image();
image.src = "img/test.jpg"; //从左到右加载方法
function drawImg1(){
var drawWidth = 0,
interval = setInterval(function(){
context.drawImage(image, 0, 0, drawWidth, image.height, 0, 0, drawWidth, image.height);
drawWidth += 20;
if(drawWidth > canvas.width) clearInterval(interval);
},100);
} //从*向左右两边拉开加载方法
function drawImg2(){
var drawWidth = 0,
drawLeft = canvas.width/2,
interval = setInterval(function(){
context.drawImage(image, drawLeft, 0, drawWidth, image.height, drawLeft, 0, drawWidth, image.height);
drawWidth += 20;
drawLeft -= 10;
if(drawLeft < 0) clearInterval(interval);
},100);
} //以逐渐横向栅格加载方法
function drawImg3(){
var drawWidth = 0,
spaceWidth = canvas.width/20, //10指分割的块数
interval = setInterval(function(){
for(var i = 0;i<20;i++){
context.drawImage(image, i*spaceWidth, 0, drawWidth, image.height, i*spaceWidth, 0, drawWidth, image.height);
}
drawWidth += 5;
if(drawWidth > spaceWidth) clearInterval(interval);
},100);
}