HTML5 用动画的表现形式装载图像

建站知识 2021-07-02 23:00www.168986.cn长沙网站建设

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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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, ispaceWidth, 0, drawWidth, image.height, ispaceWidth, 0, drawWidth, image.height);
}
drawWidth += 5;
if(drawWidth > spaceWidth) clearInterval(interval);
},100);
}

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