JQuery Magic (1) $("tagName") The getElementsByTagName() method in DOM behaves in JQuery as simply as $("tagName")!
Anonymous function to solve the window.onload event
Start with all "div" tags on the page and define a unified appearance
Define the appearance of the "body" tag
Dynamicly add a "span" tag and place it in "body"
JQuery Test< /title> <br><script src="js/jquery-1.7.1.min.js" type="text/javascript"> <br></script> <br><script type=' text/javascript'> <br>$(function () { <br>$("div").width(100) <br>.css("color", "red") <br>.css(" margin", "20px") <br>.css("border", "dotted 1px green"); <br>$(document.body).css("background-color", "#cccccc"); <br>$("<span>Four</span>").appendTo("body"); <br>}); <br></script> <br><script type="text/javascript" > <br>$(function () { <br>var v = $("div"); <br>alert(v.length); <br>for (var i = 0; i < v.length ; i ) { <br>alert(v[i].innerHTML); <br>} <br>}); <br></script> <br></head> <br><body> <br><div> <br>First div</div> <br><div> <br>Second div</div> <br><div> <br>Third div< ;/div> <br></body> <br></html> <br>
</div> <br><strong>JQuery magic (2) selector</strong> <br>tag tag (can be: p, div, button...) The tag itself has attributes such as ID and Class <br><div class="codetitle">
<span><a style="CURSOR: pointer" data="15390" class="copybut" id="copybut15390" onclick="doCopy('code15390')"><u>Copy code </u></a></span> The code is as follows: </div>
<div class="codebody" id="code15390"> <br>$("tag") //Get the collection of certain tags in the page and document.getElementsByTagName("tag") <br>$("#id") //Get the elements in the page based on id and document. .getElementById("id") <br>$("tag#id") //Get the tag element set based on id <br>$(".class") //Get the element set based on class document.getElementsByClassName( "class") <br>$("tag.class") //Get the set of elements with tag tag according to class <br>$("tag1 tag2") //Get the tag2 type elements in tag1 with the same as <br>$ ("tag1 > tag2") <br>$("tag1:has(tag2)") //Get a collection of tag1 type elements containing tag2 <br>
</div> <br>The above selector fully reflects the existence of JQuery The value is that the syntax is concise and the semantics are easy to understand. </div>
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