JS to get the screen size, current web page and browser window

jQuery

If you are using jQuery, You can use jQuery Method to get a window or document Size ：

/**
 *  Time ：2019 year 8 month 18 Japan 
 *  Front end tutorial ： https://www.pipipi.net/ 
 */
$(window).height();   // returns height of browser viewport
$(document).height(); // returns height of HTML document (same as pageHeight in screenshot)
$(window).width();   // returns width of browser viewport
$(document).width(); // returns width of HTML document (same as pageWidth in screenshot)

The screen size

For screen size you can use the following code ：

/**
 *  Time ：2019 year 8 month 18 Japan 
 *  Front end tutorial ： https://www.pipipi.net/ 
 */
screen.height;
screen.width;