JavaScript implements the pot-beating game of Gray Wolf

<div class="container">
        <h1 class="score">0</h1>
        <div class="progress"></div>
        <div id="start">
            <h2>The pot is on Big Bad Wolf</h2>
            <button class="start">Start the game</button></div>
        <div class="rules">Game Rules</div>
        <div class="rule">
            <p>Game rules:</p>
            <p>1. Game time: 60s</p>
            <p>2. Compete with hand speed, beat Gray Wolf +10 points</p>
            <p>3. Beat up Xiao Huihui - 10 points</p>
            <a href="#" rel="external nofollow" class="close">[Close]</a>
        </div>
        <div class="mask">
            <h1>GAME OVER</h1>
            <button class="reStart">Restart</button>
            <button class="finish">End the game</button>
        </div>
        <div id="finish">
            <h2>The pot is on Big Bad Wolf</h2>
            <h3>Score: <span class="scoreEnd"></span> </h3>
        </div>
    </div>

* {
    margin: 0;
    padding: 0;
}

.container {
    width: 320px;
    height: 480px;
    background: url("./images/game_bg.jpg") no-repeat 0 0;
    margin: 50px auto;
    position: relative;
}

.container>h1 {
    margin-left: 60px;
}

.container>.progress {
    width: 180px;
    height: 16px;
    background: url("./images/progress.png") no-repeat 0 0;
    position: absolute;
    top: 66px;
    left: 63px;
}

.container>#start>h2 {
    margin-top: 180px;
    color: white;
    text-align: center;
}

.container>#start>.start {
    width: 150px;
    line-height: 35px;
    text-align: center;
    color: white;
    background: linear-gradient(#E55C3D, #C50000);
    border-radius: 20px;
    border: none;
    font-size: 20px;
    position: absolute;
    top: 320px;
    left: 50%;
    margin-left: -75px;
}

.container>.rules {
    width: 100%;
    height: 20px;
    background: #ccc;
    position: absolute;
    left: 0;
    bottom: 0;
    text-align: center;
}

.container>.rule {
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    position: absolute;
    left: 0;
    top: 0;
    padding-top: 100px;
    box-sizing: border-box;
    text-align: center;
    display: none;
}

.rule>p {
    line-height: 50px;
    color: white;
}

.rule>a {
    color: red;
}

.container>.mask {
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    position: absolute;
    left: 0;
    top: 0;
    padding-top: 200px;
    box-sizing: border-box;
    text-align: center;
    display: none;
}

.mask>h1 {
    color: #ff4500;
    text-shadow: 3px 3px 0 #fff;
    font-size: 40px;
}

.mask>button {
    width: 100px;
    line-height: 35px;
    text-align: center;
    color: white;
    background: linear-gradient(#74ACCF, #007DDC);
    border-radius: 20px;
    border: none;
    font-size: 20px;
    position: absolute;
    top: 320px;
    left: 30%;
}

.mask>.reStart {
    margin-left: -50px;
}

.mask>.finish {
    margin-left: 80px;
    float: right;
}

#finish {
    color: white;
    text-align: center;
    display: none;
    margin-top: 100px;
}

#finish h2 {
    padding: 25px;
}

var begin = document.querySelector('#start');
var h = begin.querySelector('h2');
var start = document.querySelector('.start'); //Start game button var mask = document.querySelector('.mask'); //Includes restart var rules = document.querySelector('.rules'); //Game rules var rule = document.querySelector('.rule'); //Game rules details var reStart = document.querySelector('.reStart'); //Restart game button var close = document.querySelector('.close'); //Close var progress = document.querySelector('.progress'); //Progress bar var container = document.querySelector('.container'); //Container var score = document.querySelector('.score'); //Game score var finishBtn = document.querySelector('.finish'); //End game button var finish = document.querySelector('#finish'); //End game button var scoreEnd = document.querySelector('.scoreEnd'); //Final score//Click to start the game start.onclick = function() {
    // console.log(123);
    // Hide button finish.style.display = 'none';
    var fadIndex = this.parentNode;
    fadIndex.style.display = 'none';
    // Set the length of the progress bar var progressWidth = 180;
    progressHandler(progressWidth);
    var timer;
    startAnimation(); // animation starts };
// Rules // console.log(rules);
rules.onclick = function() {
    console.log('Click on the game rules');
    rule.style.display = 'block';
};
// Close close.onclick = function() {
    console.log('close');
    rule.style.display = 'none';
};
// Restart the game reStart.onclick = function() {
    score.innerHTML = 0;
    mask.style.display = 'none';
    // console.log(score.innerHTML);
    var progressWidth = 180;
    progress.style.width = '180px';
    progressHandler(progressWidth);
    startAnimation();
};
// End game button finishBtn.onclick = function() {
        mask.style.display = 'none';
        finish.style.display = 'block';
        scoreEnd.innerHTML += score.innerHTML;
        begin.style.display = 'block';
        h.style.display = 'none';
        progress.style.width = 180 + 'px';
    }
    //Progress bar function progressHandler(index) {
    // Set the timer var setProgress = setInterval(function() {
        index--;
        progress.style.width = index + "px";
        if (index <= 0) {
            clearInterval(setProgress); //Clear timer mask.style.display = 'block';
            stopAnimation(); //Stop animation}
    }, 100);
}
//Start animation function startAnimation() {
    //Define two arrays to store images var imgArr = ['./images/h0.png', './images/h1.png', './images/h2.png',
        './images/h3.png', './images/h4.png', './images/h5.png', './images/h6.png',
        './images/h7.png', './images/h8.png', './images/h9.png'
    ];
    var imgArr2 = ['./images/x0.png', './images/x1.png', './images/x2.png',
        './images/x3.png', './images/x4.png', './images/x5.png', './images/x6.png',
        './images/x7.png', './images/x8.png', './images/x9.png'
    ];
    // Define an array to save all possible positions var arrPos = [{
        left: "98px",
        top: "115px"
    }, {
        left: "17px",
        top: "160px"
    }, {
        left: "15px",
        top: "220px"
    }, {
        left: "30px",
        top: "293px"
    }, {
        left: "122px",
        top: "273px"
    }, {
        left: "207px",
        top: "295px"
    }, {
        left: "200px",
        top: "211px"
    }, {
        left: "187px",
        top: "141px"
    }, {
        left: "100px",
        top: "185px"
    }];
    // Create an image var imgs = document.createElement('img');
    imgs.setAttribute('class', 'wolfImages');
    //The random position of the image var posIndex = Math.round(Math.random() * 8);
    //Set the image display position imgs.style.position = 'absolute';
    imgs.style.left = arrPos[posIndex].left;
    imgs.style.top = arrPos[posIndex].top;
    // console.log(img.style.left);
    // Randomly get array type var imgType = Math.round(Math.random()) == 0 ? imgArr : imgArr2;
    // Set the content of the picture to be limited to the 0th to the 5th window.index = 0;
    window.indexEnd = 5;
    timer = setInterval(() => {
        if (index > indexEnd) {
            imgs.remove();
            clearInterval(timer);
            startAnimation();
        }
        imgs.setAttribute('src', imgType[index]);
        index++;
    }, 400);
    //Add picturescontainer.appendChild(imgs);
    //scorescoreEverySum(imgs);

}
// Score statistics function scoreEverySum(e) {
    e.onclick = function() {
        // Set the content of the picture to be limited to the 5th to the 9th window.index = 5;
        window.indexEnd = 9;
        // Get the path of the currently clicked image var src = this.getAttribute('src');
        // Judge based on the image address // Increase or decrease the score based on the type of image clicked if (src.indexOf("h") >= 0) {
            score.innerHTML = parseInt(score.innerHTML) + 10;
        } else {
            score.innerHTML = parseInt(score.innerHTML) - 10;
        }
        e.onclick = null
    }
}
//Stop animation function stopAnimation() {
    var img = document.querySelector('.wolfImages');
    console.log(img);
    img.remove();
    clearInterval(timer);
}