js判断ie版本ie6，7，8，10及10+

文献参考http://caibaojian.com/detect-ie-version.html
360浏览器手动切换兼容模式，设置meta和ie条件注释无法生效的使用方式参考
 

// Internet Explorer/Edge 6-10
   var isIE = document.all && document.compatMode;
 // Internet Explorer/Edge ≥ 10
   var isIE10gt = document.body.style.msTouchAction !== undefined;

// Internet Explorer/Edge 6-10
    var isIE = document.all && document.compatMode;
    // Internet Explorer/Edge ≥ 10
    var isIE10gt = document.body.style.msTouchAction !== undefined;

    if (window.location.pathname !== "/browser-download") {
        if (isIE || isIE10gt) {
            window.location.href = '/browser-download';
        }
    }