HTML5 用动画的表现形式装载图像

示例使用HTML5的canvas标签和Javascript脚本，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：

XML/HTML Code复制内容到剪贴板 <!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()">从中央到左右两边</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：

　XML/HTML Code复制内容到剪贴板　//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); } //从中央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); }

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HTML5 用动画的表现形式装载图像