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js和html5实现手机端刮刮卡抽奖效果完美兼容android/IOS

绝对值得看的来篇，哈哈 。本人亲自完成，有错误请大家指出：
现在的手机完美支持html5,所以如果手机端想要做个抽奖模块的话,用刮刮卡抽奖效果,相信这个互动体验是非常棒的
​ps:由于本人没有wp8系统的手机,所以没法兼容wp8系统的,目前完美兼容android,IOS
如果要在pc浏览的话，得改下js,目前支持谷歌，火狐，ie>=10,如果网友想要的话我就去写个
代码如下:
复制代码 代码如下:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0" />
<title>eraser effect</title>
<script type="text/javascript" src="jquery.core.js"></script>
<style>
#canvas {
background:url(winning-ticket.jpg);<!--奖品图片-->
width: 531px;
height: 438px;
}
.before{
background:none !important;
}
#canvas canvas {
cursor: url("hand.png") 0 0, auto;<!--PC端的手势图片-->
}
</style>
</head>
<body oncontextmenu="return false;" onselectstart="return false;">
<div id="canvas"></div>
</body>
<script type="text/javascript">
(function() {
window.onload = function(){
/**判断浏览器是否支持canvas**/
try{
document.createElement(canvas).getContext(2d);
}catch(e){
var addDiv = document.createElement(div);
alert(您的手机不支持刮刮卡效果哦'!);
}
};
var u = navigator.userAgent,mobile = ;
if(u.indexOf(iPhone) > -1) mobile = iphone;
if(u.indexOf(Android) > -1 || u.indexOf(Linux) > -1) mobile = Android;
function createCanvas(parent, width, height) {
var canvas = {};
canvas.node = document.createElement(canvas);
canvas.context = canvas.node.getContext(2d);
canvas.node.width = width || 100;
canvas.node.height = height || 100;
parent.appendChild(canvas.node);
return canvas;
}
function init(container, width, height, fillColor, type) {
var canvas = createCanvas(container, width, height);
var ctx = canvas.context;
// define a custom fillCircle method
ctx.fillCircle = function(x, y, radius, fillColor) {
this.fillStyle = fillColor;
this.beginPath();
this.moveTo(x, y);
this.arc(x, y, radius, 0, Math.PI * 2, false);
this.fill();
};
ctx.clearTo = function(fillColor) {
ctx.fillStyle = fillColor;
ctx.fillRect(0, 0, width, height);
};
ctx.clearTo(fillColor || "#ddd");
canvas.node.addEventListener("touchstart",function(e){
canvas.isDrawing = true;
},false);
canvas.node.addEventListener("touchend",function(e){
canvas.isDrawing = false;
},false);
canvas.node.addEventListener("touchmove",function(e){
if (!canvas.isDrawing) {
return;
}
if(type == Android){
var x = e.changedTouches[0].pageX - this.offsetLeft;
var y = e.changedTouches[0].pageY - this.offsetTop;
}else{
var x = e.pageX - this.offsetLeft;
var y = e.pageY - this.offsetTop;
}
var radius = 20;
var fillColor = #ff0000;
ctx.globalCompositeOperation = destination-out;
ctx.fillCircle(x, y, radius, fillColor);
},false);
}
var container = document.getElementById(canvas);
init(container, 531, 438, #ff0000, mobile);
})();
</script>
</html>