部分js代码

<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.lottery-unit-' + this.index).addClass('active');
		};
	},
	roll: function() {
		var index = this.index;
		var count = this.count;
		var lottery = this.obj;
		$(lottery).find('.lottery-unit.lottery-unit-' + index).removeClass('active');
		index += 1;
		if (index > count - 1) {
			index = 0;
		};
		$(lottery).find('.lottery-unit.lottery-unit-' + index).addClass('active');
		this.index = index;
		return false;
	},
	stop: function(index) {
		this.prize = index;
		return false;
	}
};
</script>