Script-based async attribute loading in non-blocking mode _ javascript skills

HTML5 implements the async attribute of the script. This new attribute allows JavaScript to be loaded in a non-blocking mode in the browser. Next we will introduce how to apply this attribute. If you are interested, you can understand it. 1. HTML5 implements the async attribute of the scriptThis new attribute allows js to be loaded in non-blocking mode in the browser. In addition, the script also has a defer attribute, all browsers have implemented this attribute (except earlier versions of firefox and chrome). IE has done a good job in this aspect and has supported some attributes from the very beginning.

The Code is as follows:

// Async