Example code of navigator.userAgent changes in IE11

When we originally judged whether the browser was IE, we could always use MSIE in navigator.userAgent, but IE11 has changed and userAgent no longer contains the MSIE field.

In the actual project, something like The error reported in the console is when verifying the browser model. The specific method is as follows:

Function getBrowserInfo(){

var Sys = {};

var ua = navigator.userAgent.toLowersCase();

var re = /(msie I firefox | chrome | opera | version).*?([\d.]+)/;

var m = ua.match(re);

Sys.browser = m[1].replace(/version/,"'safari'");

Sys.ver = m [2];

　　　 return;

　　}

　 According to this method, you can get the specific browser information in Sys. You can directly call this method for comparison. That's it;

But the production environment suddenly cannot log in. User feedback is that IE11 is used for the operation, so IE11 is used for testing directly. The specific error is as follows:

　　【 SCRIPT5007: Unable to obtain undefined or The attribute "1" referenced by null ]

According to the error display position, m cannot be obtained after positioning after regular matching;

After resolution, the ie11 browser navigator.userAgent has changed, specifically becoming: . NET4.0C; .NET4.0E; Shuame; rv:11.0) like Gecko"；

So replace the regular judgment: var re = /(msie I firefox | chrome | opera | version | rv:).* ?([\d.]+)/;

In this way, the problem is solved. The compatibility of ie11 has been greatly improved. There are still many improvements to be continued. . . . . . . . . . . . . . . . . . .

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