js 翻牌小游戏

js 翻牌小游戏

效果图

需求分析

1. 生成两组顺序随机的1-8数据
2. 卡片需要有翻转效果
3. 两次翻转数据不相等，回复原状
4. 两次翻转数据相等，卡片相等，不能再被点击
5. 当所有卡片不能被点击游戏结束
6. 限制最大点击次数50次

HTML结构

<div class="wrap">
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
        <div>
            <p class="top"></p>
            <p class="bottom"></p>
        </div>
    </div>

css布局

    实现卡片翻转效果需要3个关键属性

1. perspective: 1000px; 透视深度，形成3d视角
2. transform: rotateY(180deg);旋转
3. backface-visibility: hidden; 元素背面不可见

* {
            margin: 0;
            padding: 0;
        }

        body,
        html {
            height: 100%;
        }

        .wrap {
            perspective: 1000px;
            width: 320px;
            height: 320px;
            position: absolute;
            top: 0;
            bottom: 0;
            left: 0;
            right: 0;
            margin: auto;
            display: flex;
            justify-content: center;
            text-align: center;
            flex-wrap: wrap;
        }

        .wrap div {
            /* box-shadow: 5px 5px 10px #000; */
            transition: 1s;
            position: relative;
            text-align: center;
            line-height: 60px;
            height: 60px;
            width: 60px;
            border-radius: 10px;

            margin: 10px 10px;
        }

        .wrap div .active1 {
            transform: rotateY(180deg);
        }

        .wrap div .active2 {
            transform: rotateY(360deg);
        }

        .wrap p {
            border-radius: 10px;
            background-color: blueviolet;
            transition: 1s;
            backface-visibility: hidden;
            display: block;
            height: 60px;
            width: 60px;
            position: absolute;
            /* transform: rotateY(180deg); */
        }

        .wrap .bottom {
            transform: rotateY(180deg);
        }
        h3{
            text-align: center;
            width: 200px;
            height: 30px;
            margin: 150px auto;
        }

js

class Game {
            constructor(selector) {
                this.init(selector);
            }
            init(selector) {
                let arr = this.randomArr();
                this.nodes = [...document.querySelectorAll(selector)];//获取每一个卡片
                this.step = 50;//定义可以被点击的次数
                this.tit = document.querySelector("h3");
                this.nodes.forEach((item,index) => {//初始化卡片的值，并保存在num属性中
                    item.children[1].innerHTML = arr[index];
                    item.num =  arr[index];
                    var that = this
                    item.onclick = function () {//给每一个卡片绑定事件
                        that.handle(this);
                    }
                })
            }
            handle(ele) {
                if(this.step === 0){
                    alert('游戏结束')
                    return
                }
                if(ele.active !== true){
                    this.step--;
                    this.tit.innerText = `剩余步数：${this.step}`
                }
                ele.children[0].classList.add('active1');//卡片翻转
                ele.children[1].classList.add('active2');      
                let res = this.nodes.filter(item => item.children[0].classList.contains('active1')&& item.active !== true); //获取翻过来的且没有配对成功的卡片
                if(res.length === 2 && res[0].num !== res[1].num){//如果有两张并且数值不相等，恢复原状  
                   setTimeout(()=>{
                        res[0].children[0].classList.remove('active1');
                        res[0].children[1].classList.remove('active2');
                        res[1].children[0].classList.remove('active1');
                        res[1].children[1].classList.remove('active2');  
                    },1000)//延迟一秒形成动画    
                }else if(res.length === 2 && res[0].num === res[1].num){//如果数值相等则配对成功
                     res[0].active = true;//锁定卡片
                     res[1].active = true;
                }
            }
            randomArr() {
                let arr = [];
                for (let i = 0, n = 8; i < n; i++) {
                    do {
                        var item = randomInt(1, 8);
                    } while (arr.indexOf(item) !== -1)
                    arr.push(item);
                }
                arr.push(...arr);
                return arr;
            }
        }
        new Game('.wrap div')
        function randomInt(min, max) {//产生[min,max]范围内的整数
    return Math.round(Math.random() * (max - min)) + min
}