uniapp小程序刮刮乐抽奖

 使用canvas画布画出刮刮乐要被刮的图片，使用移动清除画布。

当前代码封装为刮刮乐的组件；

vue代码： 

scss代码：

.page{
	width: 750rpx;
	height: 100vh;
	position: relative;
}

.bg{
	width: 750rpx;
	height: 100vh;
}

.content{
	width: 750rpx;
	min-height: 100vh;
	height: 1448rpx;
	position: absolute;
	top: 0;
	left: 0;
}


.logo{
	height: 60rpx;
	display: flex;
	justify-content: center;
	margin-top: 90rpx;
	
	image{
		height: 60rpx;
	}
}

.title{
	height: 254rpx;
	display: flex;
	justify-content: center;
	margin-top: 20rpx;
	
	image{
		width: 640rpx;
		height: 254rpx;
	}
}

.notification{
	width: 370rpx;
	height: 56rpx;
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin: -60rpx auto 0 auto;
		
	view{
		width: 26rpx;
		height: 4rpx;
		background-color: #fff;
	}
	text{
		font-size: 38rpx;
		font-family: PingFangSC-Medium, PingFang SC;
		font-weight: 500;
		color: #FFFFFF;
	}
}


.box{
	width: 658rpx;
	height: 422rpx;
	margin: 110rpx auto 0 auto;
	position: relative;
	
	.scrapingBg{
		width: 100%;
		height: 100%;
	}
		
	.scrapingBox{
		width: 100%;
		height: 100%;
		position: absolute;
		left: 0;
		top: 0;
		box-sizing: border-box;
		padding: 52rpx 62rpx;
		
		.scrapingBoxContent{
			width: 536rpx;
			height: 318rpx;
			z-index: 2;
			position: relative;
			
			image{
				width: 100%;
				height: 100%;
			}
			view {
				width: 100%;
				height: 100%;
				display: flex;
				justify-content: center;
				align-items: center;
				font-size: 100rpx;
				color: #1B9AF9;
				text-shadow: 0px 4px 8px rgba(149,216,255,0.5);
			}
		}
	}
}

.count{
	display: flex;
	justify-content: center;
	margin-top: 44rpx;
	
	.tip{
		font-size: 28rpx;
		font-family: PingFangSC-Medium, PingFang SC;
		font-weight: 500;
		color: #777777;
		text{
			color: #0039AF;
		}
	} 
}

.btns{
	display: flex;
	align-items: center;
	justify-content: space-between;
	margin-top: 26rpx;
}
	
.btn{
	width: 376rpx;
	height: 166rpx;
	position: relative;
	.btnImg{
		width: 100%;
		height: 100%;
	}
		
	.btnConent{
		width: 100%;
		position: absolute;
		top: 50%;
		transform: translateY(-100%);
		display: flex;
		justify-content: center;
		align-items: center;
		image{
			width: 42rpx;
			height: 42rpx;
			margin-right: 12rpx;
		}
		text{
			font-size: 42rpx;
			font-family: PingFangSC-Medium, PingFang SC;
			font-weight: 500;
			color: #FFFFFF;
		}
	}
	
}
	

.win{
	width: 750rpx;
	height: 100vh;
	background: rgba(0, 0, 0, 0.8);
	position: fixed;
	top: 0;
	left: 0;
	z-index: 2;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
}

.win_box{
	width: 662rpx;
	height: 60%;
	padding: 40rpx;
	box-sizing: border-box;
	border-radius: 24rpx;
}

.win_box_bg{
	background: #C3E5FE;
}

.bg3{
	background: #C3E5FE;
}

.iconcolseIcon{
	font-size: 58rpx;
	margin-top: 98rpx;
}

.win_box1{
	width: 630rpx;
	height: 922rpx;
	position: relative;
}

.win_bg{
	width: 630rpx;
	height: 922rpx;
}

.win_content{
	width: 630rpx;
	height: 922rpx;
	position: absolute;
	left: 0;
	top: 0;
	display: flex;
	flex-direction: column;
	align-items: center;
}

.win_tips{
	font-size: 48rpx;
	font-family: SourceHanSansSC-Medium, SourceHanSansSC;
	font-weight: bold;
	margin-top: 290rpx;
}

.win_title{
	font-size: 48rpx;
	font-family: SourceHanSansSC-Medium, SourceHanSansSC;
	font-weight: bold;
	color: #FE6631;
	margin: 170rpx 0;
}

.win_btn{
	width: 280rpx;
	height: 80rpx;
	line-height: 80rpx;
	text-align: center;
	background: #FFE047;
	border-radius: 46rpx;
	font-size: 32rpx;
	font-family: SourceHanSansSC-Medium, SourceHanSansSC;
	font-weight: bold;
	color: #13112C;
}

.win_tit{
	font-size: 48rpx;
	font-family: SourceHanSansSC-Medium, SourceHanSansSC;
	font-weight: bold;
	margin-bottom: 32rpx;
}

.win_box2{
	width: 662rpx;
	height: 900rpx;
	background: #FFFFFF;
	border-radius: 24rpx;
	display: flex;
	flex-direction: column;
}

.items{
	width: 662rpx;
	height: 108rpx;
	background: #C3E5FE;
	border-radius: 24rpx 24rpx 0rpx 0rpx;
	display: flex;
	align-items: center;
	flex-shrink:0
}

.left,.right{
	width: 50%;
	text-align: center;
	font-family: SourceHanSansSC-Medium, SourceHanSansSC;
	font-weight: bold;
}

.i_title{
	font-size: 36rpx;
}

.list{
	height: 792rpx;
	padding-bottom: 20rpx;
	overflow: hidden;
}

.item{
	width: 662rpx;
	height: 88rpx;
	display: flex;
	align-items: center;
	justify-content: space-around;
}

.item:nth-child(2n){
	background-color: #F4F4F4;
}

.r_btn{
	width: 160rpx;
	height: 60rpx;
	line-height: 60rpx;
	text-align: center;
	background: #FFC659;
	border-radius: 46rpx;
	font-family: SourceHanSansSC-Medium, SourceHanSansSC;
	font-weight: bold;
	font-size: 32rpx;
	margin:0 auto;
}

效果: