以下是 jQuery+HTML5实现刮刮乐抽奖特效 的示例演示效果:
部分效果截图:
HTML代码(index.html):
<!DOCTYPE html>
<html>
<head>
<title>jQuery+HTML5实现刮刮乐抽奖特效</title>
<meta name="viewport" content="width=device-width,user-scalable=no,initial-scale=1,maximum-scale=1" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="js/jquery-1.9.1.js"></script>
<style type="text/css">
#bg1{ display: none; position:fixed; top: 0%; left: 0%; width: 100%; height: 100%; background-color: black; z-index:1001; -moz-opacity: 0.7; opacity:.70; filter: alpha(opacity=70);}
#show{display: none; position: fixed; background-color: #fff; z-index:1002; overflow: auto;}
</style>
</head>
<body style="overflow:hidden">
<div id="bg" style="position:absolute;top:0;left:0;"><img src="img/guaguaka_bg.png" width="100%" height="100%" / ></div>
<div id="bg2" style="width:295px;height:195px;margin:0 auto;">
<img id="bg2_img" src="img/guaguaka_word.png" width="295" height="195" style="position: absolute;">
</div>
<div>
<div id="re" style="position:absolute;top:20px;left:20px;">
<img src="img/rebi_logo.png" width="100%" height="100%" / >
<div id="re_div" style="color:white;font-family: '黑体';overflow:hidden;">x18</div>
</div>
<div id="gua" style="position:absolute;top:20px;left:80%;" align="center">
<img src="img/gua_logo.png" width="100%" height="100%" / >
<div id="gua_div" style="color:white;font-family: '黑体';overflow:hidden; ">x18</div>
</div>
</div>
<div id="gua1" style="width:295px;;margin:0 auto;" >
<img id="gua1_img" src="img/gua_image.png" style="position: absolute;">
<canvas id="front" style="position:absolute;no-repeat" />
</div>
<div id="notify" style="width:295px;height:101px;margin:0 auto;">
<img id="nImg" src="img/notice_bg.png" style="position: absolute;">
<div id="nImg_div" style="position: absolute;color:white;font-size: 17px;font-family: '黑体'" align="center">
<div style="width:245px;height:101px;padding:20px 0px 0px 50px;" align="left">每天登陆热拍有1张刮刮卡哦~元旦开始，热币可抵现金，还可抽神秘大奖！</div>
</div>
</div>
<div id="di" style="width:295px;margin:0 auto;" >
<!-- <img id="di_img" src="img/detail_declare_bg.png" style="position: absolute;">-->
</div>
<div id="bg1"></div>
<div id="show" style="position:absolute;" align="center">
<img id="show_img" src="img/dialog_bg.png" width="100%" height="100%">
<div style="margin-top:-145px;margin-left:40px;padding-right: 40px;line-height:1.5;color:#000000;font-size: 17px;font-family: '黑体'" >
亲，您今天的机会已经用完了~明天再接再励！
</div>
<img id="show_btn" src="img/btn_sure.png" style="margin-top: 30px;" onclick="hidediv()">
</div>
<script type="text/javascript">
var gua = 1,re = 2;
var imgSrc = 'img/aa.png';
function showdiv() {
document.getElementById("bg1").style.display ="block";
document.getElementById("show").style.display ="block";
}
function hidediv() {
document.getElementById("bg1").style.display ='none';
document.getElementById("show").style.display ='none';
}
$(function(){
var width = $("#show_img").width();
var height = $("#show_img").height();
var winheight=$(window).height();
var winwidth=$(window).width();
$("#show").css({"width":300+"px","height":160+"px","overflow":"hidden","margin-left":(winwidth-320)/2+"px","margin-top":winheight/3+"px"});
$("#show_btn").css({"width":176*0.5+"px","height":76*0.5+"px"});
$("#gua_div").html("x"+gua);
$("#re_div").html("x"+re);
if(gua == 0){
showdiv();
}
})
$("img").load(function(){
var body_width = $(window).width();
var body_height = $(window).height();
$("#gua1_img").width(300).height(160);
var height = 141;
var width = 285;
var bg2_width = $("#bg2_img").width();
var bg2_height = $("#bg2_img").height();
$("#gua1").css({"margin-top":"20px"});
$("#notify").css({"margin-top":"200px"});
$("#nImg").width(300).height(101);
$("#di").css({"margin-top":"50px"});
$("#di_img").width(414*0.7).height(24*0.7);
$("#gua").width(width/10).height(width/10);
$("#gua_div").css({"line-height":width/10+"px","width":width/10+"px","height":width/10+"px","margin-top":"-"+($("#gua").height())+"px","margin-left":$("#gua").height()+5+"px","font-size": $("#gua").height()/1.6+"px"});
$("#re").width(width/10).height(width/10);
$("#re_div").css({ "line-height":width/10+"px","width":width/10+"px","height":width/10+"px","margin-top":"-"+($("#gua").height())+"px","margin-left":$("#gua").height()+5+"px","font-size": $("#gua").height()/1.6+"px"});
var gua1_img_width = $("#gua1_img").width();
$("#front").css({"margin-top":9.3+"px","margin-left":7.5+"px"});
$("#bg").width("100%").height($(window).height()-1);
if(gua > 0){
bodys(height,width);
}
});
function bodys(height,width){
var img = new Image();
var canvas = document.querySelector('canvas');
canvas.style.position = 'absolute';
img.addEventListener('load',function(e){
var ctx;
var w = width, h = height;
var offsetX = canvas.offsetLeft, offsetY = canvas.offsetTop;
var mousedown = false;
function layer(ctx){
ctx.fillStyle = 'gray';
ctx.fillRect(0, 0, w, h);
}
function eventDown(e){
e.preventDefault();
mousedown=true;
}
function eventUp(e){
e.preventDefault();
mousedown=false;
}
function eventMove(e){
e.preventDefault();
if(mousedown){
if(e.changedTouches){
e=e.changedTouches[e.changedTouches.length-1];
}
var x = (e.clientX + document.body.scrollLeft || e.pageX) - offsetX || 0,
y = (e.clientY + document.body.scrollTop || e.pageY) - offsetY || 0;
with(ctx){
beginPath()
arc(x, y, 15, 0, Math.PI * 2);
fill();
}
}
}
canvas.width=w;
canvas.height=h;
canvas.style.backgroundImage='url('+img.src+')';
ctx=canvas.getContext('2d');
ctx.fillStyle='b9b9b9';
ctx.fillRect(0, 0, w, h);
layer(ctx);
ctx.globalCompositeOperation = 'destination-out';
canvas.addEventListener('touchstart', eventDown);
canvas.addEventListener('touchend', eventUp);
canvas.addEventListener('touchmove', eventMove);
canvas.addEventListener('mousedown', eventDown);
canvas.addEventListener('mouseup', eventUp);
canvas.addEventListener('mousemove', eventMove);
});
img.src = imgSrc;
(document.body.style);
}
</script>
</body>
</html>
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