js如何判断浏览器为ie6.0内核_浏览器ie6

var userAgent = navigator.userAgent.toLowerCase();

var browserId = userAgent.match(/(firefox|chrome|safari|opera|msie)/)[1];

var browserVersion = (userAgent.match(new RegExp(".+(?:version)[\/: ]([\\d.]+)")) || userAgent.match(new RegExp("(?:"+browserId+")[\/: ]([\\d.]+)")) || [0,"0"])[1];

var isIe6 = (browserId + browserVersion == "msie6.0");

ie6.0为true，否则为false