front end javascript frameworks

) Returns the nth character in a string Obj.concat (value, ...) Stitching obj.indexof (substring, Start) sub-sequence position obj.lastindexof (Substring,start) Sub-sequence position obj.substring (from, to) Get sub-sequence Obj.slice (start, end) by index nbsp; slicing obj.tolowercase () Capital Obj.touppercase () lowercase obj.split (delimiter, limit) split Obj.search (regexp) match from the beginning to return the first position wh

-detached, the front-end of the request is often by clicking on a hyperlink, then the browser takes over the subsequent, the browser makes a request to obtain data and refresh the entire page, the backend is to receive the request, by the PHP such a back-end script directly output a full HTML page. Then Ajax comes, is triggered by

controls the visibility and life cycle of variables and functions. In JavaScript, the scope of a variable has both global scope and local scope.7. Cross-domainSimply understand is because of JavaScript homologous policy limitations, a.com domain name JS can not operate B.Com or c.a.com the object under the domain name.8. Prototype chain9. Modular10. Custom Events11. Memory leaks12. Event mechanism13. Async

SpringMVC Learning Series-postscript combined with SpringMVC and Hibernate-validator, based on the background verification rules, the front-end JavaScript verification code is automatically generated, springmvcvalidator In SpringMVC Learning Series (6), we have learned how to use Hibernate-validator to verify the data legality in the background. However, backgrou

array.If a equals B, 0 is returned.If a is greater than B, a value greater than 0 is returned.Implement a sort function yourself according to the rules above:function Sortnumber (A, b) {Return A-B}When you call the Sort method, the defined sort function is passed in.Stringobj.sort (Sortnumber)The elements in the array can be traversed in the following ways:var a = [10, 20, 30, 40];for (Var i=0;iConsole.log (i);}7, null and undefinedNull indicates that the value is empty and is generally used wh

. Unlike the TypeOf method, the Instanceof method requires the developer to explicitly confirm that the object is of a particular type.26. Tell me about your understanding of node. jsA, node. js is a JAVASCRIPT runtime environment based on the Google Chrome V8 engine. node. JS uses an event-driven, non-blocking I/O model to make it lightweight and efficient. node. JS's Package Manager, NPM, is the world's largest open source library ecosystem.B, easy

date = new Date (); var date = date.tolocalestring ();//bar Date string converted to string form var ele = document.getElementById (' timer ') //from the entire HTML found id= The label of the timer, which is the input box ele.value = date; Console.log (ele) //ele is a tag object//value value is what input box shows what } var ID; Function begin () { if (id==undefined) { foo (); id = setinterval (foo,1000) } } f

Interview questions by type, mainly related to "technology" and "non-technical" two categories, today we are mainly talking about "technical", in this large category of sub-categories involved are: Mobile PC-side layout classes JavaScript Core base class Derived framework Classes Project Application Class The four categories of questions, if the frequency of occurrence to divide, then interview 100% will ask questions: "Mobi

methods of the prototype in memory and points to the memory address in the form of a prototype chain.Clones are then divided into two categories:Superficial cloning:The original type is a value pass, and the object type is still a reference passDeep cloning:All elements or attributes are completely copied, completely detached from the original object, meaning that all modifications to the new object are not reflected in the original objectDeep Clone implementations:Code Snippetsfunction Clone (

and methods of the prototype in memory and points to the memory address in the form of a prototype chain.Clones are then divided into two categories:Superficial cloning:The original type is a value pass, and the object type is still a reference passDeep cloning:All elements or attributes are completely copied, completely detached from the original object, meaning that all modifications to the new object are not reflected in the original objectDeep Clone implementations:Code Snippetsfunction Clo

Original link: http://www.cnblogs.com/woodk/articles/5199536.html JavaScript multi-threading, before the HTML5 webwork not appear many people are using concurrentthread.js analog multithreading. Often, we also use setinterval and settimeout to simulate multithreading.Introduction to the concept of multithreadingThe browser event triggers the thread, and the ajax,settimeout,setinterval is placed in the back of the program pool.Concurrent.

expression //alert (Str.split (/o/g));//The string is cut according to a regular expression. Returns an array;Alert (Str.replace (/o/g, "s"));//Hells Wsrld the string as a regular replacement.View CodeMathABS (x) the absolute value of the return number. EXP (x) returns the exponent of E. Floor (x) is rounded down with a logarithmic. Log (x) returns the natural logarithm of the number (bottom is e). Max (x, y) returns the highest value in X and Y. Min (x, y) returns the lowest

directlyMethod of the Date object:var d = new Date (); GetDate () Get the Day//getday () Get the Week//getmonth () get the Month (0-11)//getfullyear () get the full year//getyear () get year/ /gethours () Gets the hour//getminutes () gets the minute//getseconds () Gets the Seconds//getmilliseconds () Gets the milliseconds//gettime () Returns the cumulative number o

" //"string" typeof null //"Object" typeof true //"Boolean" typeof 123//"number"　　　　typeof is a unary operator (like ++,--,! ,-the unary operator), is not a function, nor is it a statement.Operator arithmetic operators+ - * / % ++ --comparison Operators> >= Attention:1 = = "1" //true1 = = = "1" //Falselogical Operators | | !Assignment Operators= += -= *= /=Process ControlIf-elsevar a = 10;if (a > 5) { Console.log ("Yes");} else { Console.log ("No");}　　If-else If-elsevar a = 10;if (a > 5)

Main content:1. JavaScript Introduction2. How JavaScript is introduced3. JavaScript variables and Naming conventions4. Five basic types of data5. Operators6. String processing7. Data type ConversionFirst, JavaScript introduction1. What is JavaScript?

than the browser giants to achieve the different standards of the Web API brings great harm. If IE supports py2,chrome support Py3,firefox support Py3.6, you will feel a little less beautiful. It doesn't seem to make sense to wait for webassembly to discuss past style. In addition, JS is not good? I like it a lot, t^t. I really want to say why JS is more suitable for the front end than Python. Fir

As a WEB Front-end engineer for website development, we should optimize the performance of our self-developed website projects as much as possible, currently, most of the website performance optimizations found on the Internet are translated and reproduced from 14 or 34 yahooss. Yahoo's optimization recommendations focus on major aspects. The W3C Group below shows you the

Front-end Engineering Optimization: javascript optimization SummaryI think optimizing javascript is a profound learning. Here, I can only stand on the shoulders of my predecessors. I want to give a simple understanding of it, but I also hope to give it a drill. If there is something wrong with it, please confirm. First

game of technical values is also difficult, that is, the knowledge structure of the global system is not systematic, these factors also objectively influence the accumulation of "Orthodox" front-end technology! In addition, all kinds of "tricks and tricks" are abused, and the inheritance of front-end technical knowled

Python development [front-end]: JavaScript, pythonjavascriptJavaScript is a literal-literal scripting language. It is a dynamic, weak, prototype-based language with built-in support. Its Interpreter, called the JavaScript engine, is a part of the browser and is widely used in the script language of the client. It was f