Jquery knowledge point 1. Differences between Jquery ready and Dom onload _ jquery

Onload indicates that all dom elements have been created, after the image and css are added, ready is triggered after the dom element is created. Therefore, jquery ready can improve the webpage response speed;
Jquery: ready standard syntax:

The Code is as follows:

$ (Document). ready (function (){
Alert ("loading ended ");
});

A $ (document) converts the document of a dom object to a jquery object, and then calls the jquery method ready (). Because dom objects cannot call jquery methods, although their relationship is very close;
Jquery: short form of ready:

The Code is as follows:

$ (Function (){
Alert ("loading ended ");
});

A major role of the ready function is to register events for dom objects:

The Code is as follows: