how to get device width everytime it changes code example

Example 1: how to check if window size of browser s changed javascript

$(window).resize(function() {
  console.log('window was resized');
});

Example 2: window change detect

// listen for window reload or part of the page reload
var oldHref = document.location.href;

window.onload = function() {
    var bodyList = document.querySelector("body")
        ,observer = new MutationObserver(function(mutations) {
            mutations.forEach(function(mutation) {
                if (oldHref != document.location.href) {
                    oldHref = document.location.href;
                    /* Changed ! your code here */
                }
            });
        });

    var config = {
        childList: true,
        subtree: true
    };
    observer.observe(bodyList, config);
};