<div class="barrage">
        <video id="myvideo" autoplay loop width="100%" height="300px">
            <source src="video/1.mp4">
        </video>
        <div class="screen">
            <div class="content">
                <!--内容在这里显示-->
            </div>
        </div>
        <!--发送对话框-->
        <div class="send">
            <input type="text" class="s_text" placeholder="使用回车可以快速发送弹幕"/>
            <input type="button" class="s_btn" value="发送" />
             <!--关闭弹幕功能-->
            <span class="barrage_close">关闭弹幕</span>
            <!-- 静音功能  -->
            <span id="muted">开启静音</span>
        </div>
  </div>

*{
    padding: 0;
    margin: 0;
}
input{
    outline: none;
}
.barrage {
    position: relative;
    width: 100%;
    height:250px;
}
#myvideo{
    position: absolute;
    /* width: 100%;
    height:300px; */
    top: -50px;
    left: 0;
    z-index: -1;
}
.barrage .screen {
    position: absolute;
    top: 0px;
    right: 0px;
    width: 100%;
    height: 300px;
}
.barrage .screen .content {
    position: relative;
    width: 100%;
    height: 250px;
    background: #000;
    opacity:0.5;
    /* filter: alpha(opacity=100); *//***针对ie8以上或者更早的浏览器****/
    background-color: transparent;
    z-index: 1;
}
.barrage .screen .content div {
    position: absolute;
    font-size: 20px;
    font-weight: bold;
    white-space: nowrap;
    line-height: 40px;
    z-index: 40;
}
.barrage .send {
    position: absolute;
    bottom: 0px;
    width: 100%;
    height: 55px;
    line-height: 55px;
    z-index: 1;
    /*background: #000;*/
    background: rgba(0,0,0,0.5);
    text-align: center;
    /*display: none;*/
}
.barrage:hover .send{
    display: block;
}
.barrage .send .s_text {
    width: 60%;
    height: 35px;
    line-height:35px;
    font-size: 16px;
    font-family: "微软雅黑";
    border-radius:20px;
    opacity: 0.8;
}
.barrage .send .s_btn {
    width: 105px;
    height: 35px;
    line-height: 35px;
    background: #22B14C;
    color: #fff;
    border-radius: 10px;
    opacity: 0.8;
}
.barrage_close,#muted {
    width: 80px;
    height: 30px;
    line-height: 30px;
    border-radius: 10px;
    text-align: center;
    color: #22B14C;
    background:#fff;
    cursor: pointer;
    opacity: 0.8;
}
#muted{
    background:yellow;
}
.barrage_close1{
    color: #fff;
    background: #fff;
}
/* css动画 */
.content div{
    animation:Text 15s infinite normal;
}
@keyframes Text{
    0%{
        left:100%;
    }
    20%{
        left:75%;
    }
    80%{
        left:0%;
    }
    100%{
        left:-30%;
    }
}

$(function () {
     $(".barrage_close").click(function(){
         $(".content div").remove();
     });
    init_barrage();
});
//将弹幕内容放进数组贮存起来
var arr=[];
var h=arr.push();
// 监听发送，按enter发送
document.οnkeydοwn=function(event){
    var e = event || window.event;
    if(e && e.keyCode==13){ 
    //    console.log(11111);
        $(".send .s_btn").click();
    }                
};
//提交评论
$(".send .s_btn").click(function () {
    var text = $(".s_text").val();
    if (text == "") {
        alert('你的内容为空，请填写评论在再发送');
        return false;
    }
    var _lable = $("<div style='right:20px;top:0px;opacity:1;color:" + getColor() + ";'class='content_text'>" + text + "</div>");
    $(".content").append(_lable.show());
    init_barrage();
    $(".s_text").val("");
});
//初始化弹幕技术
function init_barrage() {
    var _top = 0;
    $(".content div").show().each(function () {
        var _left =$(".barrage").width();//浏器览最大宽度（也是浏览器的高度），作为定位left的值
        console.log(_left);
        var _height =$(".barrage").height();//视频窗口的最大高度
        console.log(_height);
        _top += 35;
        if (_top >= (_height - 150)) {
            _top = 0;
        }
        $(this).css({ left: _left, top: _top, color: getColor() });
        //定时弹出文字
        // var time = 10000;
        // if ($(this).index() % 2 == 0) {
        //     time = 15000;
        // }
        // $(this).animate({ left: "-" + _left + "px" }, time, function () {
        //     $(this).remove();
        // });
    });
}
//获取随机颜色
function getColor() {
    return '#' + (function (h) {
        return new Array(7 - h.length).join("0") + h
    })
    ((Math.random() * 0x1000000 << 0).toString(16))
}
var video=document.getElementById("myvideo");
var mute=document.getElementById("muted");
console.log(muted);
//设置视频播放速度
// video.playbackRate = 0.5;
//视频静音
video.muted = false;
mute.οnclick=function(){
    if(video.muted){
                video.muted = false;   
                mute.innerText='';
                mute.innerText = '开启静音';
                // console.log(1111)
            }else{
                video.muted = true;   
                mute.innerText='';
                mute.innerText = '关闭静音';
                // console.log(2222)
            }
}

<a title="查看演示效果" href="https://leader755.github.io/Video-barrage/" target="_blank" >点我查看演示效果</a>

<a title="下载源码" href="https://github.com/Leader755/Video-barrage.git" target="_blank">点我下载源码</a>

<div class="barrage">
            <video id="myvideo" autoplay loop width="100%" height="300px">
                <source src="video/1.mp4">
            </video>
</div>
<style>   
.barrage {
    position: relative;
    width: 100%;
    height:250px;
}
#myvideo{
    position: absolute;
    /* width: 100%;
    height:300px; */
    top: -50px;
    left: 0;
    z-index: -1;
}
</style>