JosephBee
function isIE(_version){
  _version = _version || \'\';
  var b = document.createElement(\'b\');
  b.innerHTML = \'<!--[if IE \' + _version + \']>1<![endif]-->\';
  return b.innerHTML === \'1\';
}

console.log(isIE(6));/*判断是否是IE6*/
console.log(isIE());/*判断是否是IE浏览器*/

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