一、用到的图片
二、代码如下,重点是js部分
<script src="http://code.jquery.com/jquery-latest.js">
<script type="text/javascript">
var lottery={
index:-1,//当前转动到哪个位置,起点位置
count:0,//总共有多少个位置
timer:0,//setTimeout的ID,用clearTimeout清除
speed:20,//初始转动速度
times:0,//转动次数
cycle:50,//转动基本次数:即至少需要转动多少次再进入抽奖环节
prize:-1,//中奖位置
init:function(id){
if ($("#"+id).find(".lottery-unit").length>0) {
$lottery = $("#"+id);
$units = $lottery.find(".lottery-unit");
this.obj = $lottery;
this.count = $units.length;
$lottery.find(".lottery-unit-"+this.index).addClass("active");
};
},roll:function(){
var index = this.index;
var count = this.count;
var lottery = this.obj;
$(lottery).find(".lottery-unit-"+index).removeClass("active");
index += 1;
if (index>count-1) {
index = 0;
};
$(lottery).find(".lottery-unit-"+index).addClass("active");
this.index=index;
return false;
},stop:function(index){
this.prize=index;
return false;
}
};
function roll(){
lottery.times += 1;
lottery.roll();//转动过程调用的是lottery的roll方法,这里是第一次调用初始化
if (lottery.times > lottery.cycle+10 && lottery.prize==lottery.index) {
clearTimeout(lottery.timer);
lottery.prize=-1;
lottery.times=0;
click=false;
}else{
if (lottery.times<lottery.cycle) {
lottery.speed -= 10;
}else if(lottery.times==lottery.cycle) {
var index = Math.random()*(lottery.count)|0;
lottery.prize = index;
}else{
if (lottery.times > lottery.cycle+10 && ((lottery.prize==0 && lottery.index==7) || lottery.prize==lottery.index+1)) {
lottery.speed += 110;
}else{
lottery.speed += 20;
}
}
if (lottery.speed<40) {
lottery.speed=40;
};
//console.log(lottery.times+'^^^^^^'+lottery.speed+'^^^^^^^'+lottery.prize);
lottery.timer = setTimeout(roll,lottery.speed);//循环调用
}
return false;
}
var click=false;
window.onload=function(){
lottery.init('lottery');
$("#lottery a").click(function(){
if (click) {//click控制一次抽奖过程中不能重复点击抽奖按钮,后面的点击不响应
return false;
}else{
lottery.speed=100;
roll(); //转圈过程不响应click事件,会将click置为false
click=true; //一次抽奖完成后,设置click为true,可继续抽奖
return false;
}
});
};
效果如下:
三、注意事项
1、抽奖过程说明
真正开发中中奖物品是通过向后端接口发送请求返回的。
lottery.speed=100;
roll();
click=true;
return false;
}else{
/*<a href="/tag/cuowu/" target="_blank" class="keywords">错误</a>处理*/
if(data.errorcode==3){
$("#novip").show();
}else{
$("#notime").show();
}
}
}/*function结束*/
});/*ajax结束*/
}/*else结束*/
}
});
2、兼容性说明
.mask开始如下,用的是rgba,但是IE8不兼容,改为使用png图片background:url(images/mask.png) no-repeat;