判断浏览器大于等于ie9

方便自己查找

<script>

(function (window) {

var theUA = window.navigator.userAgent.toLowerCase();

if ((theUA.match(/msiesd+/) && theUA.match(/msiesd+/)[0]) || (theUA.match(/tridents?d+/) &&

theUA.match(/tridents?d+/)[0])) {

var ieVersion = theUA.match(/msiesd+/)[0].match(/d+/)[0] || theUA.match(/tridents?d+/)[0];

if (ieVersion <= 9) {

console.log('浏览器小于IE9,请升级!')

} else {

//执行某些操作

return true

}

}

})(window);

</script>