The 14th chapter of the "Python Road"--jquery

About jquery

What is 1.jquery ? ? Reference usage

• created by American John Resig , JQuery has attracted many JavaScript gurus from around the world to join its team.

• JQuery is another excellent Javascript framework following prototype . Its purpose is to --write less,do more, write less code , and do more things.

• It is a lightweight JS library ( only 21k after compression ) , this is not the other JS Library, it is compatible with CSS3, also compatible with a variety of browsers (IE 6.0 +, FF 1.5+, Safari 2.0+, Opera 9.0+).

• JQuery is a fast, concise JavaScript Library that makes it easier for users to work with HTML documents,events, animate, and provide easy access to the site AJAX Interaction.

• One of the big advantages of jQuery is that its documentation is full, and the various applications are very detailed, as well as a number of mature plugins to choose from.

• JQuery allows the user's HTML page to keep the code and HTML content separate, that is, there is no need to insert a bunch of JS in the HTML to invoke the command, just define ID .

2. What is a jQuery object?

• JQuery objects are objects that are produced after wrapping a DOM object through JQuery.

• JQuery the object is unique to JQuery . If an object is a jquery object , then it can use the method in jquery : $ ( "#test"). html ();

Like what:

$("#test").html()This means: Gets The HTML code within the element with ID test . where html () is the method in jQuery

This code is equivalent to implementing the code with the DOM : document.getElementById(" test ").innerHTML;

although jQuery The object is produced after wrapping DOM jQuery Span class= "S3" > cannot use DOM DOM object also cannot use jQuery . error

Convention : If you get a jQuery object , precede the variable with $.

var $variable = jQuery对象

var variable = DOM对象

Two search elements (important selectors and filters)

2.1 Selector

2.1.1 Basic Selector

$ ("*") $ ("#id") $ (". Class") $ ("element") $ ("  . Class,p,div")       //Each selector is matched to the element that is merged and returned together.

　　

　　

The 14th chapter of the "Python Road"--jquery