How to use javascript conditionally like CSS3 media queries, orientation?

Question

How to use javascript conditionally like CSS3 media queries, orientation?

For Example I can write css for specific

@media only screen and (width : 10         


        

Answer 1

...I want to run a javascript only if max-width of browser is 1900px and min-width is 768

EDIT: Actually, that was all wrong. If you're using a mobile device, use:

function doStuff(){
    landscape = window.orientation? window.orientation=='landscape' : true;

    if(landscape && window.innerWidth<1900 && window.innerWidth > 768){
        //code here
    }
}
window.onload=window.onresize=doStuff;
if(window.onorientationchange){
    window.onorientationchange=doStuff;
}