jQuery Basic Syntax

jQuery overview:

jQuery is a JS framework (JS class library) that encapsulates traditional JS.

JS commonly used frameworks: jQuery/ExtJS/DWR/Prototype...

Getting started with jQuery:

　　1. Introduce jQuery's js file:  <script src="jQuery.js file address"></script> 

　　2. jQuery entry function (page loading):  $( function (){ } ); 

　　   JS page load function:  window.onload = function (){}; 

　　   Difference: jQuery method: it can be executed multiple times, which is more efficient than window.onload, and executed after the DOM tree of the page is drawn.

　　　　　 JS method: Execute after the page is loaded.

　　3. $ is equivalent to jQuery

js object and jQuery object conversion

　　JS object to jQuery object: eg:  var d = document.getElementById("d" ); $(d); // Convert js object d to jquery object. 

　　jQuery object to JS object:

　　　　Method 1:  $("#d1")[0]; 

　　　　Method 2:  $("#d1").get(0);