js check screen width code example

Example 1: javascript screen size

var w = window.innerWidth;
var h = window.innerHeight;

Example 2: get screen width javascript

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

Example 3: js know size of screen

alert("Your screen resolution is: " + screen.width + "x" + screen.height)

Example 4: device width js

window.screen.availWidth

Example 5: js know size of screen displayed

var win = window,
    doc = document,
    docElem = doc.documentElement,
    body = doc.getElementsByTagName('body')[0],
    x = win.innerWidth || docElem.clientWidth || body.clientWidth,
    y = win.innerHeight|| docElem.clientHeight|| body.clientHeight;
alert(x + ' × ' + y);