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46 lines
1.4 KiB
46 lines
1.4 KiB
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function LotteryDraw(obj, callback) {
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this.timer = null; //计时器
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this.startIndex = obj.startIndex-1 || 0; //从第几个位置开始抽奖 [默认为零]
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this.count = 0; //计数，跑的圈数
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this.winingIndex = obj.winingIndex || 0;//获奖的位置
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this.totalCount = obj.totalCount || 6;//抽奖跑的圈数
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this.speed = obj.speed || 100;
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this.domData=obj.domData;
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this.rollFn();
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this.callback = callback;
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}
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LotteryDraw.prototype = {
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rollFn: function() {
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var that = this;
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// 活动index值增加，即移动到下一个格子
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this.startIndex++;
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//startIndex是最后一个时一圈走完，重新开始
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if (this.startIndex >= this.domData.length - 1) {
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this.startIndex = 0;
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this.count++;
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}
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// 当跑的圈数等于设置的圈数，且活动的index值是奖品的位置时停止
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if (this.count >= this.totalCount && this.startIndex === this.winingIndex) {
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if (typeof this.callback === 'function') {
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setTimeout(function() {
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that.callback(that.startIndex,that.count); //执行回调函数，抽奖完成的相关操作
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}, 400);
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}
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clearInterval(this.timer);
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}else { //重新开始一圈
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if (this.count >= this.totalCount - 1) {
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this.speed += 30;
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}
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this.timer = setTimeout(function() {
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that.callback(that.startIndex,that.count);
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that.rollFn();
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}, this.speed);
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}
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}
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}
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module.exports = LotteryDraw; |