Sharp jquery (1) Conversion of--dom objects to jquery objects

1. Understanding jquery

1. DOM object: The Document Object model
2. jquery object: An object that is produced after wrapping a DOM object through jquery. This is unique to jquery objects, where you cannot use any of the DOM object's methods in a JQuery object, and the DOM object cannot use the jquery object. (This is the one I often mix when I write code)
3. The interchange of Dom objects and jquery objects: typically preceded by a jquery object with $

• • The jquery object is converted into a DOM object:
    • The jquery object is an array-like object that can be obtained by using the [index] method of the corresponding DOM object

      The code is as follows  var $CR = $ ("#cr");  jquery Object  var cr = $CR [0];        Dom Object

    • Another method is provided by jquery itself, which obtains the corresponding DOM object through the Get (Idnex) method

      The code is as follows  var $CR = $ ("#cr");  jquery Object  var cr = $cr. get[0];        Dom Object

  • Dom object converted to jquery object
    • For DOM objects, you only need to wrap the object in $ () to get a jquery object.

      The code is as follows  var cr = document.getElementById ("Cr");  Dom Object  var $CR = $ (CR);        jquery Object

Sharp jquery (1) Conversion of--dom objects to jquery objects