[JQuery] jquery Objects and Dom objects

jquery objects are objects that are produced after jquery wraps a DOM object, and they all use only their own methods.

1, when defining variables, by $ to differentiate:

var $variable = jquery object;

var variable = jquery object;

2, jquery objects and Dom objects can be converted to each other;

2.1 jquery Object---"Dom object

var $CR = $ ("#cr");

var cr = $CR [0]; Or, var cr = $cr. Get (0);

2.2 DOM Object--"jquery object

var cr = document.getElementById ("Cr");

var $CR = $ (CR);

3. When to convert?

The jquery approach is introduced by default after the introduction of the jquery file, but if the method provided by jquery does not meet the requirements, the JavaScript itself can be used as a way to pass the above conversion.

[JQuery] jquery Objects and Dom objects