


js nextSibling attribute and previousSibling attribute overview and usage notes_Basic knowledge
This attribute represents the next node of the current node (the subsequent nodes belong to the same level as the current node); if there is no node of the same level thereafter, null is returned.
It is important to note that the execution results of this attribute are not the same in different browsers. See the following example:
Let’s look at an example first:
On the surface, the structure of this object shows that the nextSibling of div has only 2 items - two inputs node. But there are actually 5 items -/n,input,/n,input,/n. This is because input is used as a label to create various form input controls. Whether it is generating buttons, checkboxes, radios... or other form controls, IE will automatically create a 1-byte blank at the end.
IE will skip the space document nodes (such as line feed characters) generated between nodes, but Mozilla will not do this - FF will treat layout elements such as space breaks and line feeds as node reads, so in The next node element that can be read using nextSibling in IE needs to be written like this in FF: nextSibling.nextSibling.
opera and safari handle nextSibling in the same way as FF
2: previousSibling attribute
This attribute has the opposite effect to the nextSibling attribute. For example: someTagObject.nextSibling.previousSibling actually returns the tag element itself, but the premise must be: there must be a sibling element behind the tag element, otherwise null will be returned.
3: Attribute issues with HTML tag element objects obtained through nextSibling or previousSibling
Generally, the tag name is first obtained through nextSibling.nodeName, or through nextSibling.nodeType. Its label type, then if the nextSibling.nodeName = #text, its text value is obtained through nextSibling.nodeValue; otherwise, its properties can be obtained through other common label element properties such as nextSibling.innerHTML.

JavaScript core data types are consistent in browsers and Node.js, but are handled differently from the extra types. 1) The global object is window in the browser and global in Node.js. 2) Node.js' unique Buffer object, used to process binary data. 3) There are also differences in performance and time processing, and the code needs to be adjusted according to the environment.

JavaScriptusestwotypesofcomments:single-line(//)andmulti-line(//).1)Use//forquicknotesorsingle-lineexplanations.2)Use//forlongerexplanationsorcommentingoutblocksofcode.Commentsshouldexplainthe'why',notthe'what',andbeplacedabovetherelevantcodeforclari

The main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.

Whether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.

Python and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.

JavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.

JavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.

Choosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.


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