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：
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- <!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：
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- //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);
- }
以上内容是小编给大家介绍的HTML5 用动画的表现形式装载图像，希望对大家有所帮助！
