how to get device width in javascript code example

Example 1: get screen width javascript

window.screen.width
//or just
screen.width

Example 2: java script find screen size of device

// Size of browser viewport.
$(window).height();
$(window).width();

// Size of HTML document (same as pageHeight/pageWidth in screenshot).
$(document).height();
$(document).width();

Example 3: device width js

window.screen.availWidth