jquery - Do something if screen width is less than 960 px -

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how can make jquery if screen width less 960 pixels? code below fires 2nd alert, regardless of window size: 

if (screen.width < 960) {     alert('less 960'); } else {      alert('more 960'); }

use jquery width of window. 

if ($(window).width() < 960) {    alert('less 960'); } else {    alert('more 960'); }

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