javascript getelementsbyclassname

Document directory Syntax Instance Instance-Infinite Loop Syntax Instance By using JavaScript, we have the ability to execute code after a set interval, rather than immediately after the function is called. We call it a timing event.Instance Simple timing After you click the button in this example, a warning box will pop up in five seconds. Another simple timing In this example, the program runs 2 seconds, 4 seconds

Upgrade JavaScript (JavaScript you Don't know) to improve javascriptRecently, I have read the book "JavaScript (on-volume) You don't know", which details many important but often overlooked JavaScript points. I strongly recommend this book !!! In the book, Chapter 1 describes "Upgrade", describes the process of variabl

JavaScript notes (browser-DOM operations), javascriptdom1 Browser Pay attention to the identification of various domestic browsers, such as XX Security browser and XX tornado browser. They only make a shell, and the core of their calls is IE, there are also "dual-core" browsers that support both IE and Webkit.The main difference between different browsers in JavaScript support is that some APIs have differe

=document.getElementById("intro"); If this element is found, the method returns the element in the form of an object (in x.If this element is not found, x contains null.Search for HTML elements by Tag NameIn this example, find the element id = "main", and then find all Instance var x=document.getElementById("main");var y=x.getElementsByTagName("p"); Find HTML elements by Class NameIn this example, the getElementsByClassName function is used to find th

, the method returns the element as an object (in X).If the element is not found, X will contain null.find HTML elements by tag nameThis example finds the element of id= "main" and then looks for all Instance var X=document.getelementbyid ("main"); var y=x.getelementsbytagname ("P"); Find HTML elements by class nameThis example uses the Getelementsbyclassname function to find elements of the class= "Intro":Instance var x=document.

JavaScript-the most misunderstood language analysis JavaScript in the world is one of the world's most popular programming languages. . In fact, every personal computer in the world is installed and at least one Jav is frequently used. AScript interpreter. The popularity of JavaScript is entirely due to his The position in the WWW scripting language field is dete

. In addition, it is a pseudo Array. If you want to operate them like an Array, you need to call them like Array. prototype. slice. call (nodeList, 2. Node search API Document. getElementById: searches for elements by ID. It is case sensitive. If multiple results exist, only the first one is returned; Document. getElementsByClassName: searches for elements by class name. Multiple class names are separated by spaces and an HTMLCollection is returned

IDgetElementsByTagName (tagname) return a collection of objects in an array--document that all elements are tagnameGetelementsbyclassname (classname) return a collection of all objects in the array--document that are named ClassName (this method is new in the HTML5 DOM)* Here's a small thing to do, because HTML5 DOM provides getelementsbyclassname, so there may be browsers that don't. But I don't think so, so I can hand-

1.1) Dom-core Method: (not specifically for JS, any programming language that supports the DOM can use it, their purpose is not limited to the processing of web pages, can also be used to handle any kind of markup language written processing documents)①getelementbyid ()②getelementsbytagname ()③getelementsbyclassname ()④getattribute ()⑤setattribute ()2) Html-dom Method: (is an HTML-specific attribute and cannot be used in any other markup language docu

Sort out common operations of JavaScript on various types of elements in DOM, including javascriptdom Node TypeNodeTypeThe following are some important nodeType values:1: element2: attr3: text8: Comment comments9: document NodeName, nodeValue Node relationshipChildNodes: each node has a childNodes attribute, which stores a NodeList object. FirstChild: equivalent to childNodes [0] LastChild: equivalent to childNodes. length-1 You can also access other

Believe that every developer knows the importance of caching. There is a cached background (Memcached,xcache, etc.) from beginning to end. ) to reduce the pressure on db. In the Content distribution network (CDN) cache, you want your browser to cache those loaded resources more than once. Of course, there is client-side caching, so you don't have to repeat expensive operations (even algorithms or a lot of operations). This is an introduction to a good JavaS