弹幕 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        .container {
            width: 500px;
            height: 600px;
            margin: 100px auto;

        }

        .video {
            width: 500px;
            height: 500px;
            position: relative;
            display: flex;
            align-items: center;
        }

        .video img {
            width: 100%;
            height: 100%;
        }

        .botom {
            width: 100%;
            height: 100px;
            display: flex;

        }

        .botom .input {
            flex: 1;
            /* height: 100px; */
        }

        .botom button {
            height: 100%;
        }

        .video p {
            position: absolute;
            left: 100%;
            display: flex;
            align-items: center;

        }

        .video p img {
            width: 50px;
            height: 50px;
            border-radius: 50%;
        }

        .video p span {
            display: block;
            margin-left: 10px;
            white-space: nowrap;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="video">
            <img class="vdimg" src="../images/3.jpg" alt="">
            <!-- <p>
                <img src="../images/3.jpg" alt="">
                <span>弹幕内容</span>
            </p> -->
        </div>
        <div class="botom">
            <input type="text" class="input">
            <button class="btn">发送</button>
        </div>
    </div>



    <script>
        var ocontainer = document.querySelector('.container')
        var ovideo = document.querySelector('.video')
        var obtn = document.querySelector('.btn')
        var oinput = document.querySelector('.input')


        obtn.onclick = function () {
            var msg = oinput.value
            if (msg) {
                create(msg)
            }

        }







        //生成弹幕
        function create(msg) {

            var op = document.createElement('p')
            op.innerHTML = `
                <img src="../images/3.jpg" alt="">
                <span>${msg}</span>
                `
            ovideo.appendChild(op)
            var maxY = ovideo.clientHeight - op.offsetHeight

            var x = random(0, maxY)
            op.style.cssText = `top:${x}px`
            move(-op.offsetWidth, op, 'left', 21, function () {
                op.remove()
            })
        }



        function random(min, max) {
            return parseInt(Math.random() * (max - min) + min)
        }

        function move(end, ele, attr, speed, fb) {
            var sta = parseInt(getStyle(ele, attr))
            var speed = end > sta ? speed : -speed
            var t = setInterval(function () {
                sta += speed
                ele.style[attr] = sta + 'px'
                if (Math.abs(end - sta) < Math.abs(speed)) {
                    sta = end
                    ele.style[attr] = sta + 'px'
                    clearInterval(t)
                    if (fb) {
                        fb()
                    }
                }
            }, 100)
        }





        function getStyle(ele, attr) {
            if (window.getComputedStyle) {
                return getComputedStyle(ele)[attr]
            } return ele.currentStyle[attr]
        }
    </script>





</body>

</html>

 

posted @ 2021-07-08 19:55  JSkolo_yyds  阅读(37)  评论(0)    收藏  举报