html5刮刮卡,h5刮刮卡效果

HTML5页面的作用及应用场景有哪些

HTML5页面的作用

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1、令企业发展更开阔：HTML5页面作为新兴的微信推广工具，可以应用各种各样的场景，比如产品展示、购买流程，购物车等，能让客户有更快的速度体验，不再卡顿。

2、令体验更完美：HTML5页面中的各种炫酷创新的场景模拟、动画效果、互动方式，都能给用户带来新鲜独特的完美体验，这是传统手机页面所不能媲美的。

HTML5页面可以运用到哪些应用场景

1、企业宣传：高大上的游戏能帮助企业快速聚集人气，让你的客户订单从游戏开始。

2、企业招聘：令企业走向人才，令人才近距离了解企业、认识企业，令招聘更高效。

3、商业营销：通过HTML5特性，使用大转盘，刮刮卡，满减满增等增加客户粘性，从而达到营销目的。

4、报名预约：旅游线路报名、教育课程报名、餐厅预约等场合都可以，多种表单预设，也可以自己创建新的预约流程，自由选择。

html5画布常用吗

html5 Canvas在实现动画上性能会比DOM操作好，就是占用内存会比较多一点。html Canvas目前用的频率还算是比较高，特别是在html5游戏、html5 3d效果、html5动画等会用的会比较多。

html5 Canvas场景举例：

HTML5 弹幕功能

HTML5 刮刮卡功能

HTML5 游戏开发

HTML5 动画效果

备注：canvas提供的功能更原始，适合像素处理，动态渲染和大数据量绘制。

参考资料：

《canvas 系列教程》

html5 canvas 刮刮卡问题

!DOCTYPE html

html

head

meta http-equiv="content-type" content="text/html; charset=UTF-8"

title - jsFiddle demo by artwl/title

script type='text/javascript' src='/js/lib/dummy.js'/script

link rel="stylesheet" type="text/css" href="/css/result-light.css"

style type='text/css'

body{

height:1000px;

}

#lotteryContainer {

position:relative;

width: 300px;

height:100px;

}

#drawPercent {

color:#F60;

}

/style

/head

body

button id="freshBtn"刷新/buttonlabel已刮开 span id="drawPercent"0%/span 区域。/label

div id="lotteryContainer"/div

script type='text/javascript'//![CDATA[

function Lottery(id, cover, coverType, width, height, drawPercentCallback) {

this.conId = id;

this.conNode = document.getElementById(this.conId);

this.cover = cover;

this.coverType = coverType;

this.background = null;

this.backCtx = null;

this.mask = null;

this.maskCtx = null;

this.lottery = null;

this.lotteryType = 'image';

this.width = width || 300;

this.height = height || 100;

this.clientRect = null;

this.drawPercentCallback = drawPercentCallback;

}

Lottery.prototype = {

createElement: function (tagName, attributes) {

var ele = document.createElement(tagName);

for (var key in attributes) {

ele.setAttribute(key, attributes[key]);

}

return ele;

getTransparentPercent: function(ctx, width, height) {

var imgData = ctx.getImageData(0, 0, width, height),

pixles = imgData.data,

transPixs = [];

for (var i = 0, j = pixles.length; i j; i += 4) {

var a = pixles[i + 3];

if (a 128) {

transPixs.push(i);

}

return (transPixs.length / (pixles.length / 4) * 100).toFixed(2);

resizeCanvas: function (canvas, width, height) {

canvas.width = width;

canvas.height = height;

canvas.getContext('2d').clearRect(0, 0, width, height);

drawPoint: function (x, y) {

this.maskCtx.beginPath();

var radgrad = this.maskCtx.createRadialGradient(x, y, 0, x, y, 30);

radgrad.addColorStop(0, 'rgba(0,0,0,0.6)');

radgrad.addColorStop(1, 'rgba(255, 255, 255, 0)');

this.maskCtx.fillStyle = radgrad;

this.maskCtx.arc(x, y, 30, 0, Math.PI * 2, true);

this.maskCtx.fill();

if (this.drawPercentCallback) {

this.drawPercentCallback.call(null, this.getTransparentPercent(this.maskCtx, this.width, this.height));

}

bindEvent: function () {

var _this = this;

var clickEvtName = device ? 'touchstart' : 'mousedown';

var moveEvtName = device? 'touchmove': 'mousemove';

if (!device) {

var isMouseDown = false;

document.addEventListener('mouseup', function(e) {

isMouseDown = false;

}, false);

} else {

document.addEventListener("touchmove", function(e) {

if (isMouseDown) {

e.preventDefault();

}

}, false);

document.addEventListener('touchend', function(e) {

isMouseDown = false;

}, false);

}

this.mask.addEventListener(clickEvtName, function (e) {

isMouseDown = true;

var docEle = document.documentElement;

if (!_this.clientRect) {

_this.clientRect = {

left: 0,

top:0

};

}

var x = (device ? e.touches[0].clientX : e.clientX) - _this.clientRect.left + docEle.scrollLeft - docEle.clientLeft;

var y = (device ? e.touches[0].clientY : e.clientY) - _this.clientRect.top + docEle.scrollTop - docEle.clientTop;

_this.drawPoint(x, y);

}, false);

this.mask.addEventListener(moveEvtName, function (e) {

if (!device !isMouseDown) {

return false;

}

var docEle = document.documentElement;

if (!_this.clientRect) {

_this.clientRect = {

left: 0,

top:0

};

}

var x = (device ? e.touches[0].clientX : e.clientX) - _this.clientRect.left + docEle.scrollLeft - docEle.clientLeft;

var y = (device ? e.touches[0].clientY : e.clientY) - _this.clientRect.top + docEle.scrollTop - docEle.clientTop;

_this.drawPoint(x, y);

}, false);

drawLottery: function () {

this.background = this.background || this.createElement('canvas', {

style: 'position:absolute;left:0;top:0;'

});

this.mask = this.mask || this.createElement('canvas', {

style: 'position:absolute;left:0;top:0;'

});

if (!this.conNode.innerHTML.replace(/[\w\W]| /g, '')) {

this.conNode.appendChild(this.background);

this.conNode.appendChild(this.mask);

this.clientRect = this.conNode ? this.conNode.getBoundingClientRect() : null;

this.bindEvent();

}

this.backCtx = this.backCtx || this.background.getContext('2d');

this.maskCtx = this.maskCtx || this.mask.getContext('2d');

if (this.lotteryType == 'image') {

var image = new Image(),

_this = this;

image.onload = function () {

_this.width = this.width;

_this.height = this.height;

_this.resizeCanvas(_this.background, this.width, this.height);

_this.backCtx.drawImage(this, 0, 0);

_this.drawMask();

}

image.src = this.lottery;

} else if (this.lotteryType == 'text') {

this.width = this.width;

this.height = this.height;

this.resizeCanvas(this.background, this.width, this.height);

this.backCtx.save();

this.backCtx.fillStyle = '#FFF';

this.backCtx.fillRect(0, 0, this.width, this.height);

this.backCtx.restore();

this.backCtx.save();

var fontSize = 30;

this.backCtx.font = 'Bold ' + fontSize + 'px Arial';

this.backCtx.textAlign = 'center';

this.backCtx.fillStyle = '#F60';

this.backCtx.fillText(this.lottery, this.width / 2, this.height / 2 + fontSize / 2);

this.backCtx.restore();

this.drawMask();

}

drawMask: function() {

this.resizeCanvas(this.mask, this.width, this.height);

if (this.coverType == 'color') {

this.maskCtx.fillStyle = this.cover;

this.maskCtx.fillRect(0, 0, this.width, this.height);

this.maskCtx.globalCompositeOperation = 'destination-out';

} else if (this.coverType == 'image'){

var image = new Image(),

_this = this;

image.onload = function () {

_this.maskCtx.drawImage(this, 0, 0);

_this.maskCtx.globalCompositeOperation = 'destination-out';

}

image.src = this.cover;

}

init: function (lottery, lotteryType) {

this.lottery = lottery;

this.lotteryType = lotteryType || 'image';

this.drawLottery();

}

window.onload = function () {

var lottery = new Lottery('lotteryContainer', '#CCC', 'color', 300, 100, drawPercent);

lottery.init('', 'image');

document.getElementById('freshBtn').onclick = function() {

drawPercentNode.innerHTML = '0%';

lottery.init(getRandomStr(10), 'text');

}

var drawPercentNode = document.getElementById('drawPercent');

function drawPercent(percent) {

drawPercentNode.innerHTML = percent + '%';

}

function getRandomStr(len) {

var text = "";

var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

for( var i=0; i len; i++ )

text += possible.charAt(Math.floor(Math.random() * possible.length));

return text;

}

//]]

/script

/body

/html

亲，看看这个对你有帮助么

网页题目：html5刮刮卡,h5刮刮卡效果
文章起源：http://scyanting.com/article/dscoeop.html

html5刮刮卡,h5刮刮卡效果

HTML5页面的作用及应用场景有哪些

html5画布常用吗

html5 canvas 刮刮卡问题

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