How to load a script only in IE

I'm curious why you specifically need to target IE browsers, but the following code should work if that really is what you need to do:

<script type="text/javascript">    if(/MSIE \d|Trident.*rv:/.test(navigator.userAgent))        document.write('<script src="somescript.js"><\/script>');</script>

The first half of the Regex (MSIE \d) is for detecting Internet Explorer 10 and below. The second half is for detecting IE11 (Trident.*rv:).

If the browser's user agent string matches that pattern, it will append somescript.js to the page.

currentScript is [supported][1] in all browsers besides IE

<script>    // self-invoked wrapper for scoping the `document` variable    !function( d ) {        if( !d.currentScript ){            var s = d.createElement('script')            s.src = 'ie.js'            d.head.appendChild(s)        }    }(document)</script>

The above will conditionally append a script file only for IE browsers.[1]: https://developer.mozilla.org/en-US/docs/Web/API/Document/currentScript#Browser_compatibility

If someone still looking at running IE specific Javascript then this code still works tested in IE(11), and non IE browsers(Chrome,Firefox,Edge)

<script type="text/javascript">    if(/MSIE \d|Trident.*rv:/.test(navigator.userAgent))        document.write('<script src="../nolng/js/ex1IE.js"><\/script>        <script src="../nolng/js/ex2IE.js"><\/script>');    else        document.write('<script src="../nolng/js/ex1.js"><\/script>       <script src="../nolng/js/ex2.js"><\/script>');</script>