Javascript Global Object – window

window object: The window object represents a window containing a DOM document

Properties:

  1. window.document:  returns a reference to the document contained in the window.

Example:

HTML Snippet:

<head>

<title>Hello, World!</title>

</head>

JS Snippet:

var doc = window.document;
console.log(doc.title); // Hello, World!

2. window.screen: The screen object contains information about the visitor’s screen.

Example:

var screen = window.screen;

console.log(screen.width);

Detect IE Browser and Return version

Detect Browser Internet Explorer and Return the version:

function detectIE() {

var ua = window.navigator.userAgent;

var msie = ua.indexOf('MSIE ');
if (msie > 0) {
// IE 10 or older => return version number
return parseInt(ua.substring(msie + 5, ua.indexOf('.', msie)), 10);
}

var trident = ua.indexOf('Trident/');
if (trident > 0) {
// IE 11 => return version number
var rv = ua.indexOf('rv:');
return parseInt(ua.substring(rv + 3, ua.indexOf('.', rv)), 10);
}

var edge = ua.indexOf('Edge/');
if (edge > 0) {
// Edge (IE 12+) => return version number
return parseInt(ua.substring(edge + 5, ua.indexOf('.', edge)), 10);
}

// other browser
return false;

}