jQuery study notes DOM object and jQuery object_jquery
What is a DOM object?
HTML organizes documents in a tree structure, as follows:
1-4< /title> <br><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <br><!-- Introducing jQuery --> <br><script src="../scripts/jquery-1.3.1.js" type="text/javascript"></script> <br><script type="text/javascript"> <br>//Wait for the dom element to be loaded. <br>$(document).ready(function(){ <br>var domObj = document.getElementsByTagName("h3")[0]; // Dom object<br>var $jQueryObj = $(domObj); //jQuery object <br>alert("DOM object: " domObj.innerHTML); <br>alert("jQuery object: " $jQueryObj.html()); <br>}) ; <br></script> <br></head> <br><body> <br><h3>Example</h3> <br><p title="Choose your favorite of fruit." >What is your favorite fruit?</p> <br><ul> <br><li>Apple</li> <br><li>Orange</li> ; <br><li>Pineapple</li> <br></ul> <br></body> <br></html> <br>
</div> <br>HTML above The DOM tree of the file is as follows:
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<strong>What is a jQuery object? <br></strong><br>jQuery object is a DOM object packaged by jQuery, as follows: <br><br>$(domObj) is equivalent to document.getElementsByTagName("h3") <br>$("#ID ") Equivalent to document.getElementsById("ID") <br><br><strong>Conversion of jQuery objects and DOM objects? </strong> <br><br>1. Get the object: <br><br>Get the jQuery object: var $variable=jQuery object; <br>Get the DOM object: var variable=DOM object; <br>2.jQuery Object to DOM object: <br><br>Use array to convert var cr=$("#cr")[0]; <br>Use get(index) method to convert var cr=$("#cr").get (0); <br>3. DOM object to jQuery object: <br>var cr=document.getElementsById("cr"); //Get DOM object<br>var $cr=$(cr);//Conversion as jQuery object
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