js判断是否是IE浏览器

html

<!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>
    
    .closeBrowser{
        width: 100%;
        display: block;
        
    }
    .closeBrowser .closeWrapper{
        z-index: 1
    }
    .closeBrowser .closeWrapper .layer{
        position: absolute;
        top:50%;
        left: 50%;
        _position: absolute;
        _top:50%;
        _left: 50%;
        transform: translate(-50%,-50%);
        -o-transform: translate(-50%,-50%);
        background-color: #fff;
        z-index: 1;
        width: 45%;
    }

    .closeBrowser .closeWrapper .layer p{
        padding: 0;
        margin: 0;
        background-color: #F8F8F8;
        line-height: 40px;
        margin-bottom: 20px;
        text-indent: 10%;
    }
    .closeBrowser .closeWrapper a{
        display: block;
        padding: 20px;
        text-align: center;
        text-decoration: none;
        font-size: 14px;
        color: #333;
      
    }
    .closeBrowser .closeWrapper .closebtn{
        position: relative;
        height: 60px;
    }
    .closeBrowser .closeWrapper .btn{
        position: absolute;
        left: 50%;
        top:0;
        _position: absolute;
        _top:50%;
        _left: 50%;
        transform: translate(-50%,0);
        -o-transform: translate(-50%,0);
        border-color: #1E9FFF;
        background-color: #1E9FFF;
        color: #fff;
        height: 28px;
        line-height: 28px;
        margin: 5px 5px 0;
        padding: 0 15px;
        border: 1px solid #dedede;
        background-color: #fff;
        color: #333;
        border-radius: 2px;
        font-weight: 400;
        cursor: pointer;
        text-decoration: none;
    }
    .closeBrowser .closeWrapper .layer .content{
        width: 90%;
        margin: 0 auto;
        padding: 16px;
        color: #999;
        font-size: 14px;
    }
    .closeBrowser  .closeMask{
        width: 100%;
        height: 100%;
        opacity: 0.8;
        background: #000;
        position: absolute;
    }
    </style>
</head>
<body>
    <div class="closeBrowser">
       
        <div class="closeWrapper">
            <div class="layer">

                    <p class="tip">提示</p>
                    <div id="layercontent" class="content"></div>
                    <a href="http://down.360safe.com/cse/360cse_9.5.0.138.exe">推荐下载360速度浏览器</a>
                   <div  class="closebtn">
                        <button class="btn">或关闭浏览器</button>
                   </div>

            </div>
        </div>
        
        <div class="closeMask"></div>
    </div>
</body>
</html>

<script>
        var closebtn=document.querySelector('.btn');//关闭按钮
        var closeBrowser=document.querySelector('.closeBrowser');//需要关闭那个对话框
        closebtn.onclick=function(){
            window.close()
        }
       var agent=navigator.userAgent
       if(agent.indexOf("MSIE")>0){
          closeBrowser.style.display='block';
          document.getElementById('layercontent').innerHTML='对不起，当前浏览器不支持访问此网站，请点击下面的链接下载或者关闭当前浏览器'
       }else{
        closeBrowser.style.display='none';
        alert('您的浏览器是'+navigator.userAgent)
       }
    </script>

　　如下图

js判断是否是IE浏览器

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