Window. onload and jquery $ (document). Ready

First, window. onload is executed only after all the content on the webpage is loaded, while $ (document ). ready is executed only after the DOM of the webpage is fully drawn. Obviously, the latter is much faster than the former. If a large image is to be displayed on the webpage, it takes a long time to execute window. onload. Therefore, we sometimes try to avoid this situation. $ (Document). Ready does not need to wait for the image to be downloaded. As long as the file object (DOM) is loaded, it can be executed.

Second, you cannot write multiple window. onload files. Otherwise, an error occurs. $ (document). Ready can make any

Third, window. onload is not abbreviated as $ (document). Ready (function () {}) can be abbreviated as $ (function (){})