JS实现的视频弹幕效果示例

2019-11-19 13:14:26

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本文实例讲述了JS实现的视频弹幕效果。分享给大家供大家参考，具体如下：

<!DOCTYPE html><html lang="zh-CN"><head>  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  <meta charset="utf-8">  <title>斗鱼弹幕</title>  <style>    html,body{font-size:10px;overflow:hidden;margin:0;padding:0;}    #box{width:100%;height:100%;}    #dm{width:100%;height:90vh;background:#E8F1F5;}    #dm span{width:auto;height:3rem;font-size:2rem;line-height:2rem;position:absolute;white-space:nowrap;}    #idDom{width:100%;height:10vh;background:#666;position:absolute;bottom:0;display:flex;align-items:center;justify-content:center;}    #content{width:50rem;height:10vh;display:flex;align-items:center;justify-content:center;}    .title{font-size:2.2px rein;color:#fff;line-height:#ccc;}    .text{width:30rem;height:2.5rem;border:none;border-radius:.5rem;font-size:1.4rem;margin:0 .5rem;padding:0 1rem;}    .btn{width:6rem;height:3rem;border:none;background:red;color:#fff;}  </style></head><body><div class="box" id="box">  <div id="dm"></div>  <div class="idDom" id="idDom">    <div id="content">      <p class="title">吐槽:</p>      <input type="text" class="text" id="text" placeholder="请输入你想说的话" />      <button type="button" class="btn" id="btn">发射!</button>    </div>  </div></div><script langugae="javascript">var timer;var btn = document.getElementById('btn');btn.onclick = function() { addBarrage();}document.onkeydown = function(evt) {var event = evt || window.event;if (event.keyCode == 13) {addBarrage();}}var colors = ['#2C3E50', '#FF0000', '#1E87F0', '#7AC84B', '#FF7F00', '#9B39F4', '#FF69B4'];//弹幕颜色库function addBarrage() {  clearInterval(timer);  var text = document.getElementById('text').value;  document.getElementById('text').value = "";    var index = parseInt(Math.random() * colors.length); //随机弹幕颜色  var screenW = window.innerWidth;  var screenH = dm.offsetHeight;  var max = Math.floor(screenH / 40);  var height = 10 + 40 * (parseInt(Math.random() * (max + 1)) - 1);  var span = document.createElement('span');  span.style.left = screenW + 'px';  span.style.top = height + 'px';  span.style.color = colors[index];  span.innerHTML = text;  var dmDom = document.getElementById('dm');  dmDom.appendChild(span);  timer = setInterval(move, 10);}function move() {  var arr=[];  var oSpan=document.getElementsByTagName('span');  for(var i=0;i<oSpan.length;i++){    arr.push(oSpan[i].offsetLeft);    arr[i] -= 2;    oSpan[i].style.left = arr[i]+'px';    if(arr[i]<-oSpan[i].offsetWidth){      var dmDom=document.getElementById('dm');      dmDom.removeChild(dmDom.childNodes[0]);    }  }}</script></body></html>

运行效果如下图所示：