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：<!DOCTYPEhtml>
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：
感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具：http://tools.jb51.net/code/HtmlJsRun，测试代码运行效果。
JS 视频弹幕