Black Horse DAY16 jquery Primer

Jquery:

1.jQueryobject is throughJQueryPackagingDOMObject that is generated after the object。jquery objects are unique to jquery. If an object is a jquery object, it can use the method in jquery: $ ("#test"). html ();

For example:

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

This code is equivalent to using the DOM Implementation code:

document.getElementById ("test"). InnerHTML;

Although jquery objects are created after wrapping a DOM object, jquery cannot use any of the DOM object's methods, nor does the DOM object use the methods in jquery. Random use will errorConventions:If you are getting a JQuery object, precede the variable with $. ? var$variable = JQuery Object? varvariable = DOM Object 2. If you use jquery :In head: <script language= "JavaScript" src= ". /js/jquery-1.4.2.js "&GT;&LT;/SCRIPT&GT;SRC The directory structure where the jquery framework is importedConvert a 3.dom object to a jquery object ... jquery into a DOM object ...

(1). Dom object converted to jquery object

<script language= "JavaScript" >   //dom into jquery object  $ (DOM object) var Obj=document.getelementbyid (" Username ");//alert (Obj.value)   ; var $obj =$ (obj);   Alert ($obj. Val ());  </script>

(2). jquery objects are converted to DOM objects ...

Method One: The jquery object is an array object that can be obtained by means of the [index] ObjectWay Two: jquery itself provides, through the. Get (Index) method, to get the corresponding DOM object

<script language= "JavaScript" >   //jquery objects into DOM objects   //(1) The JQuery object is an array object that can be obtained by means of [index] to the corresponding DOM object   var $username =$ ("#username");   var username= $username [0];   alert (username.value);   (2) jquery itself provides, through the. Get (Index) method, to get the corresponding Dom object     var $username =$ ("#username");   var username= $username. Get (0);   alert (username.value);  </script>

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Black Horse DAY16 jquery Primer