VUE 实现一个简易老虎机的项目实践

<div class="lhj_box" >
          // 这里直接 搞三组
          <div class="lhj_item" v-for="ite in 3" :key="ite"  >
           // ref 标识，到时候获取，用于计算高度
              <ul :class="`lhj_ul_${ite}`" ref="ul" >
                    <li v-for="(item,index) in img" :key="index"  >
                        <img :src="require(`../assets/images/l_gift${item}.png`)" alt="">
                    </li>
              </ul>
          </div>
</div>

/**
 * 金额依次为1.1 1.2 1.3 1.4 1.5
 * **/ 
let UL_BOXS = []
export default {
    name:'lhj',
    data() {
        return {
            img: [],
            liHeight: 0,
            arr: [4,5,4],//中奖数组
        }
    },
    created() {
        this.setArr()
    },
    async mounted() {
        let evenTransition = this.whichTransitionEvent()
        await this.$nextTick()
        // 获取 ul 3个 box
        UL_BOXS = this.$refs.ul
        // 计算每个 图片高度
        let ulH = UL_BOXS[0].offsetHeight
        // 我自己默认循环的 50个图片
        this.liHeight = ulH / 50 
        // 监听动画结束函数
        UL_BOXS[2].addEventListener(evenTransition,rest,false)
        let that = this
        // 复位函数
        function rest() {
            for(let i = 0;i < that.arr.length;i++){
                let y =  (that.arr[i] - 1) * that.liHeight
                that.aniImg(y,i,0)
                
            }
            alert('中奖下标'+JSON.stringify(that.arr))
        }
        
    },
    beforeDestroy() {
        UL_BOXS = null
    },
    methods: {
        async toStart() {
            // 圈数
            let loop = 3
            // 一圈基础高度 奖品数*每个高度
            let base = 5*this.liHeight
            for(let i = 0;i < this.arr.length; i++){
                let a = await this.delayPerform(i*100)
                if( a == 1){
                    let y = base*loop + (this.arr[i] - 1)*this.liHeight
                    this.aniImg(y,i)
                }
            }
        },
        // 目标位置
        aniImg(y,index,duration = 3000) {
            UL_BOXS[index].style.transitionDuration = `${duration}ms`
            UL_BOXS[index].style.transform = `translate(0px, -${y}px) translateZ(0px)`
        },
        // 设置重复数组
        setArr() {
            let arr = [1,2,3,4,5]
            let img2 = []
            for(let i = 0 ;i<10;i++){
                img2.push(...arr)
            }
            this.img = Object.freeze(img2)
        },
        // 改变中奖位置
        toChang() {
            this.arr = [1,1,1]
        },
        // 延时函数
        delayPerform(delay = 200) {
            return new Promise((resolve,reject) => {
                setTimeout(()=>{
                    resolve(1)
                },delay)
            })
        },
        // 动画兼容
        whichTransitionEvent(){
            let el = document.createElement('span'),
            transitions = {
                'transition':'transitionend',
                'OTransition':'oTransitionEnd',
                'MozTransition':'transitionend',
                'WebkitTransition':'webkitTransitionEnd'
            };
            for(let t in transitions){
                if( el.style[t] !== undefined ){
                    return transitions[t];
                }
            }
            el = null;
        }
    }
}
</script>