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An example of judging IE8 and below versions

零下一度
零下一度Original
2017-06-24 14:17:291744browse

Determine IE8 and below versions: 

(function(){var isIE = function () {var U = navigator.userAgent,
IsIE = U.indexOf('MSIE') > -1,
a = IsIE ? /\d+/.exec(U.split(';')[1]) : 'no ie';return a <= 8;
}();if(isIE){
window.location.href = &#39;IEBrowser.html&#39;;
}

})();
IEBrowser.html
    <div style="border:5px red solid; margin: 10% auto; text-align: center; color: red;"><img style="margin: 20px 0"; src="img/IE.png"><h1 style="line-height: 50px">珍爱生命，远离IE!</h1><h1 style="line-height: 40px">本站不支持IE8及其以下所有版本的IE浏览器浏览! 请摒弃老旧的IE使用高级浏览器访问本站！</h1><a href="https://www.baidu.com/s?wd=浏览器&rsv_spt=1&rsv_iqid=0xed4aa79300016c40&issp=1&f=8&rsv_bp=0&rsv_idx=2&ie=utf-8&rqlang=&tn=maxthon2&ch=2&rsv_enter=1&inputT=507" target="_blank" style="font: 30px/60px &#39;微软雅黑&#39;;">浏览器下载</a></div>

It is said that learning front-end is not easy, and IE is also a big trouble. Everyone should reject IE together. hehe.

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