Comparison between async and DOMScript file loading

Async and script dynamic loading can make files asynchronously loaded. This article describes their impact on page rendering and load loading.

Async and script dynamic loading can make files asynchronously loaded. This article describes their impact on page rendering and load loading.

Currently, I use demo. js to execute file operations. Code:

Var now = function () {return + (new Date ();} var t_s = now (); while (now ()-t_s <2000 ){}

Use sleep. php as the request file. Code:

<? Php sleep (3); echo 'var BB';?>

1. General script tag Loading